Research

Harnessing the abundant resource of sunlight

Rachel Sauer — Tue, 24 Jun 2025 17:55:24 +0000

Harnessing the abundant resource of sunlight Rachel Sauer Tue, 06/24/2025 - 11:55

Arindam Sau , Amreen Bains and Anna Wolff

Light-powered reactions could make the chemical manufacturing industry more energy-efficient

Manufactured chemicals and materials are necessary for practically every aspect of daily life, from life-saving pharmaceuticals to plastics, fuels and fertilizers. Yet manufacturing these important chemicals comes at a steep energy cost.

Many of these industrial chemicals are derived primarily from fossil fuel-based materials. These compounds are typically very stable, making it difficult to transform them into useful products without applying harsh and energy-demanding reaction conditions.

Arindam Sau, a Ph.D. candidate in the CU Boulder Department of Chemistry, along with Colorado State University research colleagues Amreen Bains and Anna Wolff, have been working on a system that uses light to power reactions commonly used in the chemical manufacturing industry.

As a result, transforming these stubborn materials contributes significantly to the world’s overall energy use. In 2022, the industrial sector consumed 37% of the world’s total energy, with the chemical industry responsible for approximately 12% of that demand.

Conventional chemical manufacturing processes use heat to generate the energy needed for reactions that take place at high temperatures and pressures. An approach that uses light instead of heat could lower energy demands and allow reactions to be run under gentler conditions — like at room temperature instead of extreme heat.

Sunlight represents one of the most abundant yet underutilized energy sources on Earth. In nature, this energy is captured through photosynthesis, where plants convert light into chemical energy. Inspired by this process, our team of chemists at the Center for Sustainable Photoredox Catalysis, a research center funded by the National Science Foundation, has been working on a system that uses light to power reactions commonly used in the chemical manufacturing industry. We published our results in the journal Science in June 2025.

We hope that this method could provide a more economical route for creating industrial chemicals out of fossil fuels. At the same time, since it doesn’t rely on super-high temperatures or pressures, the process is safer, with fewer chances for accidents.

How does our system work?

The photoredox catalyst system that our team has developed is powered by simple LEDs, and it operates efficiently at room temperature.

At the core of our system is an organic photoredox catalyst: a specialized molecule that we know accelerates chemical reactions when exposed to light, without being consumed in the process.

Much like how plants rely on pigments to harvest sunlight for photosynthesis, our photoredox catalyst absorbs multiple particles of light, called photons, in a sequence.

These photons provide bursts of energy, which the catalyst stores and then uses to kick-start reactions. This “multi-photon” harvesting builds up enough energy to force very stubborn molecules into undergoing reactions that would otherwise need highly reactive metals. Once the reaction is complete, the photocatalyst resets itself, ready to harvest more light and keep the process going without creating extra waste.

Designing molecules that can absorb multiple photons and react with stubborn molecules is tough. One big challenge is that after a molecule absorbs a photon, it only has a tiny window of time before that energy fades away or gets lost. Plus, making sure the molecule uses that energy the right way is not easy. The good news is we’ve found that our catalyst can do this efficiently at room temperature.

Enabling greener chemical manufacturing

CSU chemistry researcher Amreen Bains performs a light-driven photoredox catalyzed reaction. (Photo: John Cline/Colorado State University Photography)

Our work points toward a future where chemicals are made using light instead of heat. For example, our catalyst can turn benzene — a simple component of crude oil — into a form called cyclohexadienes. This is a key step in making the building blocks for nylon. Improving this part of the process could reduce the carbon footprint of nylon production.

Imagine manufacturers using LED reactors or even sunlight to power the production of essential chemicals. LEDs still use electricity, but they need far less energy compared with the traditional heating methods used in chemical manufacturing. As we scale things up, we’re also figuring out ways to harness sunlight directly, making the entire process even more sustainable and energy-efficient.

Right now, we’re using our photoredox catalysts successfully in small lab experiments — producing just milligrams at a time. But to move into commercial manufacturing, we’ll need to show that these catalysts can also work efficiently at a much larger scale, making kilograms or even tons of product. Testing them in these bigger reactions will ensure that they’re reliable and cost-effective enough for real-world chemical manufacturing.

Similarly, scaling up this process would require large-scale reactors that use light efficiently. Building those will first require designing new types of reactors that let light reach deeper inside. They’ll need to be more transparent or built differently so the light can easily get to all parts of the reaction.

Our team plans to keep developing new light-driven techniques inspired by nature’s efficiency. Sunlight is a plentiful resource, and by finding better ways to tap into it, we hope to make it easier and cleaner to produce the chemicals and materials that modern life depends on.

Arindam Sau is a Ph.D. candidate in the �� Department of Chemistry; Amreen Bains is a postdoctoral scholar in chemistry at Colorado State University; Anna Wolff is a PhD student in chemistry at Colorado State University.

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Light-powered reactions could make the chemical manufacturing industry more energy-efficient.

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Healing Indigenous communities from the ground up

Rachel Sauer — Mon, 23 Jun 2025 23:46:02 +0000

Healing Indigenous communities from the ground up Rachel Sauer Mon, 06/23/2025 - 17:46

Sarah Kuta

Mushroom mycelium can clean up the soil. Can it also help Indigenous people reconnect to the land? CU Boulder researcher Natalie Avalos aims to find out

Fungi are powerful and versatile organisms. They’re being used in a variety of beneficial ways, from degrading hard-to-recycle plastics and purifying contaminated water to developing new medicines and restoring forests after wildfires.

Now an innovative project from the �� will explore fungi’s ability to remediate urban soil and, in the process, reconnect Indigenous families to the land.

The project is being led by Natalie Avalos, a CU Boulder assistant professor of ethnic studies and core faculty member of the Center for Native American and Indigenous Studies (CNAIS). She’s working in partnership with Carissa Garcia, a Denver-based writer, educator and combat veteran with Picuris Pueblo heritage.

CU Boulder researcher Natalie Avalos, an assistant professor of ethnic studies, is leading a project to explore fungi’s ability to remediate urban soil and, in the process, reconnect Indigenous families to the land.

With grant funding from CNAIS, the duo plans to use mushroom mycelium to clean up the soil at various locations in Denver and Commerce City. They hope to inoculate small farm plots and garden beds on properties that are owned or rented by Indigenous people.

Soil remediation will allow Indigenous families to grow their own foods and medicines and may even lead to the revitalization of ancient crops. But, beyond that, Avalos and Garcia hope their land-based healing project will help Indigenous people restore and strengthen their sacred relationship with the land.

“We talk about decolonization as land repatriation, or the return of Indigenous lands to Indigenous people,” says Avalos. “But this is a form of rematriation, thinking about land as mother and returning to this relationship where you are tending to the health and well-being of the mother so that she can better attend to your health and well-being in return. Restoring that symbiotic relationship is profoundly impactful for families.”

The power of fungi

Mycelium is the name for the network of dense, fibrous, root-like threads that make up the body of a fungus. It’s typically hidden underground, often out of sight and out of mind until it produces mushrooms, which grow above the soil and help fungi reproduce.

In the wilderness, mycelium acts as nature’s clean-up crew. It plays a vital role in decomposition, breaking down dead plants and returning essential nutrients to the soil.

But researchers have also come to realize that mycelium can be a powerful ally for combating pollution. The process, known as “mycoremediation,” harnesses fungi’s natural abilities to remove or break down harmful contaminants in the soil. Scientists are using fungi to clean up everything from heavy metals and pesticides to petrochemicals and other hazardous substances.

Avalos and Garcia want to use mycelium to create healthy and resilient soil for Indigenous families, including some that live in heavily polluted areas on Colorado’s Front Range. They plan to take detailed measurements before, during and after inoculation, to see how the mycelium affects the soil, as well as the plants that will eventually grow in it. Based on these initial results, they hope to expand their mycoremediation work to other Indigenous farms and gardens—and, possibly, even to tribal lands.

They also want to use the soil remediation project to create hands-on educational opportunities for Indigenous communities, particularly Indigenous youth.

Garcia will spearhead the soil remediation work, which is slated to begin later this year. Then, after the mycelium works its magic, Avalos will investigate how the project is affecting Indigenous people.

“I’ll start collecting some oral histories, some ethnographic testaments about what this means to them,” says Avalos. “How is this confirming their relationship to land? How is it speaking to or shaping their religious life, their sense of identity, their Indigeneity? How is it that having restored soil is supporting their health and wellness and contributing to human flourishing?”

“We talk about decolonization as land repatriation, or the return of Indigenous lands to Indigenous people. But this is a form of rematriation, thinking about land as mother and returning to this relationship where you are tending to the health and well-being of the mother so that she can better attend to your health and well-being in return. Restoring that symbiotic relationship is profoundly impactful for families.”

Sovereignty and self-determination

Avalos is also curious to learn how soil remediation might contribute to sovereignty and self-determination for Indigenous people, especially those living in cities. Today, roughly 70% of American Indians and Alaska Natives live in urban areas—but this population is often overlooked.

“How is it that Native people can act as stewards of land, even though they often have less control over that land?” Avalos says. “They may be renters, they may be living in very polluted areas. But just to have that little bit of agency.”

Denver sits on the ancestral homelands of the Arapaho, the Cheyenne, the Ute and other tribes. But, today, the city is home to Indigenous people with a wide array of tribal backgrounds. This diversity largely stems from a federal program that pushed Native Americans away from reservations and into urban areas in the 1950s and ‘60s, as part of the government’s broader attempts to force Indigenous people to assimilate. Denver was one of nine relocation sites located across the country.

“For folks living in cities that have been impacted by displacement and disconnection, I want to document, how are they reconnecting? How are they re-Indigenizing?” Avalos says.

As the world grapples with pressing environmental issues, many Indigenous people are now looking to their sacred ways of life for answers. Long displaced from their lands and separated from their traditional cultural practices, they’re returning to ancestral medicines, deepening their relationships with all living creatures and opening themselves up to the knowledge that’s embedded in the land.

Avalos and Garcia hope their soil remediation project might play a small role in that broader work.

“We can’t count on the treaties, we can’t count on our federal leadership or even our state leadership to really protect us and protect land,” says Garcia. “My generation is looking at a grim future. We’re at a place where many of us are asking, how do we embody the Indigeneity and our sacred ways of knowing and being, and mesh that with an Indigenous futurism that will heal the planet and our people?”

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Mushroom mycelium can clean up the soil. Can it also help Indigenous people reconnect to the land? CU Boulder researcher Natalie Avalos aims to find out.

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Top image: mycelium growing on a log (Photo: iStock)

CU Boulder scientist receives $1.25 million award for cancer research

Rachel Sauer — Wed, 18 Jun 2025 17:12:44 +0000

CU Boulder scientist receives $1.25 million award for cancer research Rachel Sauer Wed, 06/18/2025 - 11:12

Edward Chuong is one of five researchers nationwide awarded funding to pursue ‘daring, paradigm-shifting research’ on cancer immunotherapy treatment

Edward Chuong, a �� assistant professor of molecular, cellular and developmental biology and a BioFrontiers Institute scientist, has been awarded $1.25 million by the New York City-based Cancer Research Institute (CRI) to pursue his cancer immunotherapy research.

Chuong was one of five researchers nationwide who received the unrestricted funding over a five-year period, which CRI said is designed to allow researchers to pursue high-risk, high-reward projects that could redefine cancer treatment. The organization called the researchers “scientific leaders poised to reshape cancer immunotherapy through daring, paradigm-shifting research.”

Edward Chuong, a CU Boulder assistant professor of molecular, cellular and developmental biology and a BioFrontiers Institute scientist, recently was awarded $1.25 million by the Cancer Research Institute to pursue cancer immunotherapy research.

“These are people who are hitting their stride scientifically and career-wise, and this is where you really want to put some jet fuel in the tank as they are getting established,” said Dr. E. John Wherry, associate director of CRI’s Scientific Advisory Council.

Echoing Wherry’s sentiment, Dr. Alicia Zhou, CRI chief executive officer, added, “Each of these researchers brings fearless curiosity and a willingness to challenge assumptions – the very qualities that drive breakthroughs. They aren’t just advancing cancer science; they are reinventing it.”

Chuong said he was surprised and honored to receive CRI funding for his research.

“As someone from an evolutionary biology background, this award means my outsider ideas are being welcomed into the cancer research community. It’s a huge boost,” he said.

Chuong’s research focuses on the role that ancient viral fragments in human DNA, called transposons, play in regulating immune cell signaling.

“Our lab started out exploring the evolution of transposons—bits of DNA derived from genetic parasites—and discovered they may function as hidden switches in our immune system,” Chuong said. “With this support, we’ll investigate how cancer cells hijack these switches to escape detection, and use that knowledge to develop new markers and therapies that make immunotherapy work better for more patients. I’m grateful to the Cancer Research Institute for supporting this unconventional perspective and I’m incredibly excited to see where it leads.”

Each year, CRI awards funding for scientists to pursue their research through its grant-making program honoring its founding scientific and medical director, Lloyd J. Old. The organization said its Lloyd J. Old STAR program—Scientists TAking Risks—is designed to provide long-term funding to mid-career scientists, giving them the freedom and flexibility to pursue research “at the forefront of discovery and innovation in cancer immunotherapy.”

CRI said its awards are given out based upon its “exceptional track record of identifying and supporting people who have had a major impact in immunotherapy.” The organization said its grants are not tied to a specific research project but rather support outstanding researchers based upon the quality and promise of researchers’ overall work.

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Edward Chuong is one of five researchers nationwide awarded funding to pursue ‘daring, paradigm-shifting research’ on cancer immunotherapy treatment.

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Farm-diversification research wins top international prize

Rachel Sauer — Tue, 17 Jun 2025 16:03:33 +0000

Farm-diversification research wins top international prize Rachel Sauer Tue, 06/17/2025 - 10:03

Clint Talbott

CU Boulder’s Zia Mehrabi is one of three researchers named international champions of the Frontiers Planet Prize for research that finds environmental and social benefits of agricultural diversification

Widespread agricultural diversification could improve the health of the world’s environment and that of its people, a landmark study published last year found.

Zia Mehrabi, assistant professor of environmental studies at the ��, has been named one of three international champions in the Frontiers Planet Prize, the Frontiers Research Foundation announced today. Mehrabi and his team will receive $1 million in funding to advance their research.

The Frontiers Planet Prize celebrates breakthroughs in Earth system and planetary science that “address these challenges and enable society to stay within the safe boundaries of the planet’s ecosystem.” The prize puts scientific rigor and ingenuity at its heart, helping researchers worldwide accelerate society toward a green renaissance, the Frontiers Research Foundation says.

Zia Mehrabi, a CU Boulder assistant professor of environmental studies, has been named the U.S. national champion for the Frontiers Planet Prize.

Professor Jean-Claude Burgelman, director of the Frontiers Planet Prize, said the planet faces immense threats that require bold, transformative solutions rooted in evidence and validated by science.

“Innovative yet scalable solutions are the only way for us to ensure healthy lives on a healthy planet,” Burgelman said. “By spotlighting the most groundbreaking research, we are helping scientists bring their work to the international stage and provide the scientific consensus needed to guide our actions and policies.”

Mehrabi, who leads the Better Planet Laboratory, was recognized, alongside his co-authors, for an article published last year in the journal Science titled “Joint environmental and social benefits from diversified agriculture.”

Laura Vang Rasmussen of the University of Copenhagen in Denmark and Ingo Grass of the University of Hohenheim in Germany were lead authors of the paper, which had 58 co-authors. Claire Kremen of the University of British Columbia was a senior author and co-principal investigator on the study.

The researchers found that diversifying crops and animals and improving habitat, soil and water conservation on individual farms can improve biodiversity while improving or, at a minimum, not coming at a cost to yields. Additionally, diversified farming can yield social benefits and improve food security—showing improved food access or a reduced number of hungry months, for example, particularly in smallholder systems.

The more diversification measures farms employed, the more benefits accrued, researchers observed. Essentially, the team found evidence to move toward agriculture that more closely reflects natural systems.

“If you look at how ecosystems operate, it’s not just plants growing alone. It’s not just animals or soil,” Mehrabi said last year. “It’s all of these things working together.”

Using data from 2,655 farms across 11 countries and covering five continents, the researchers combined qualitative methods and statistical models to analyze 24 different datasets. Each dataset studied farm sites with varying levels of diversification, including farms without any diversification practices. This allowed the team to assess the effects of applying more diversification strategies.

Diversified farming differs from the dominant model of agriculture: growing single crops or one animal on large tracts of land. That efficient, “monoculture” style of farming is a hallmark of agriculture after the Green Revolution, which reduced global famine by focusing on high-yield crops that rely on fertilizers and pesticides.

“The Green Revolution did many, many great things, but it came with a lot of costs,” Mehrabi says, noting that synthetic fertilizers and pesticides harm the environment.

Also, to increase labor productivity, large farms rely on mechanization, which tends to “replace people with machines.”

“So, the idea of trying to engineer nature into our agricultural systems is somewhat antithetical to the whole way we think about agricultural development,” Mehrabi says.

Making a case for a different way of doing agriculture is one thing. Implementing it on a widespread basis is something else. The dominant view, fostered by “big ag” (short for agriculture), is that “if you want to do ag, you’ve got to do it this way,” Mehrabi says.

“If you look at how ecosystems operate, it’s not just plants growing alone. It’s not just animals or soil. It’s all of these things working together,” says Zia Mehrabi.

“Our work challenges that idea, but it’s a bit of a David-and-Goliath situation,” he adds. “We have the stone, but it hasn’t yet landed.”

But it’s necessary to confront Goliath, Mehrabi contends, noting that agriculture affects all the things people care about environmentally, including climate change, water security, biodiversity, pollution, land use and habitat destruction.

A third of the Earth’s land is used for agriculture, and about a quarter of greenhouse gas emissions stem from agriculture, he notes. Climate change has reduced agricultural yields by as much as 5% to 10% in the last four decades, research has shown.

“If we want to do something about environmental issues, agriculture is one of the big buckets that we need to really, really start in.”

Separate from the research published in Science, Mehrabi has done modeling of the future state of agriculture globallyif the world continues business-as-usual farming. He found that in the next century, the number of farms is likely to be cut in half and the average size of farms would likely double.

Given that, along with what scientists know about the loss of natural ecosystems as farm sizes increase, “the future looks a little bit bleak,” Mehrabi says. But this new research shows it could be different.

Though he does not suggest that all farms must be small farms, he does advise that agriculture strive to diversify systems that have been “massively depleted and massively simplified.”

�� the Frontiers Planet Prize, Mehrabi says he and his team are gratified to be recognized as one of three international champions. Additionally, he underscores the importance of the Frontiers Research Foundation’s financial commitment to this kind of research, calling it a “signal” to other funding entities that might follow suit.

“We need to really think about innovation in agriculture,” Mehrabi said. “We all need food to eat. We really need to innovate, and we should put money behind that. It’s worth it.”

Launched by the Frontiers Research Foundation on Earth Day 2022, the prize encourages universities worldwide to nominate their top three scientists working on understanding and putting forward pathways to stay within the safe operating space of nine planetary boundaries that are outlined by the Stockholm Resilience Center.

These nominations are then vetted at the national level, and the top scientists face an independent jury of 100—a group of renowned sustainability and planetary health experts chaired by Professor Johan Rockström—who vote for the National and International Champions.

Read a guest opinion by Zia Mehrabi and co-authors at this link. See a Q&A with Mehrabi about adding carbon-footprint labels on food at this link.

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CU Boulder prof named Boettcher Investigator

Rachel Sauer — Fri, 06 Jun 2025 18:38:17 +0000

CU Boulder prof named Boettcher Investigator Rachel Sauer Fri, 06/06/2025 - 12:38

Assistant Professor Jennifer Hill is one of seven Colorado researchers to be recognized by the Boettcher Foundation for their pioneering biomedical research

The Boettcher Foundation and Colorado BioScience Association (CBSA) have named Assistant Professor Jennifer H. Hill with the ��’s Department of Molecular, Cellular and Developmental Biology and BioFrontiers Institute as one of seven outstanding early-career biomedical researchers.

Each scientist will receive a $250,000 grant through the Boettcher Foundation’s Webb-Waring Biomedical Research Awards Program to support up to three years of independent scientific research, with total grant funding reaching $1.75 million.

CU Boulder scientist Jennifer Hill, an assistant professor of molecular, cellular and developmental biology, has been named a 2025 Boettcher Investigator.

“It’s a huge honor to be selected as one of this year’s Boettcher Investigators, especially given the depth of groundbreaking biomedical research in Colorado,” Hill said. “The award gives my lab the resources to explore the relevance of our work in human tissues, bringing us closer to our goal of preventing type 1 diabetes in children. As a young investigator, receiving funds like these goes a long way to help offset some of the anxiety and uncertainty in the current federal funding landscape.”

This year’s class represents the next generation of scientific excellence and marks another milestone in Boettcher Foundation’s 16-year commitment to strengthening Colorado’s biomedical research ecosystem, according to the Boettcher Foundation. The Webb-Waring Biomedical Research Awards provide crucial early-career support and position recipients to compete for additional private, state and federal research funding.

“We are delighted to support our 2025 Boettcher Investigators, and as champions of their work, we are confident that these researchers will continue to spark new discoveries and drive innovation in medicine,” said Katie Kramer, president and CEO of the Boettcher Foundation. “The far-reaching impact of our Investigators’ research extends well beyond the lab—each advancement sets in motion a ripple effect that benefits patients, strengthens Colorado’s scientific community, and inspires future breakthroughs. We are proud to invest in these remarkable scientists, whose dedication and creativity are shaping a healthier future for all.”

Hill is a microbe scientist who studies the connection between the pancreas and microbes in the gut, examining microbiota in the development of insulin-producing beta cells. Four Boettcher Investigators with the University of Colorado Anschutz Medical Campus and two with Colorado State University are pursuing research into fields including osteoarthritis, autism spectrum disorder, cancer and autoimmune diseases, and developmental and neurological disorders.

Since its inception, the Webb-Waring Biomedical Research Awards Program has supported 113 Boettcher Investigators, including this year’s class, and awarded close to $27 million in grant funding. These researchers have gone on to secure more than $150 million in additional research funding from federal, state and private sources, according to the Boettcher Foundation.

“Colorado BioScience Association is grateful to the Boettcher Foundation for its continued investment in the next generation of scientific leaders in our state,” said Elyse Blazevich, president and CEO of Colorado BioScience Association. “The Webb-Waring Biomedical Research Awards provide essential early-career funding that empowers researchers to remain in Colorado and advance their discoveries within our world-class academic and research institutions. We are honored to celebrate the accomplishments of the 2025 class of Boettcher Investigators.”

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Assistant Professor Jennifer Hill is one of seven Colorado researchers to be recognized by the Boettcher Foundation for their pioneering biomedical research.

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Tree rings offer clues to small-population growth

Rachel Sauer — Thu, 05 Jun 2025 15:54:21 +0000

Tree rings offer clues to small-population growth Rachel Sauer Thu, 06/05/2025 - 09:54

Daniel Long

In a recently published paper, PhD student Ellen Waddle and her coauthors provide some clarity on a decades-old problem

When researching what drives the growth of small populations, ecologists consider several factors, says Ellen Waddle, a PhD student in the ��’s Department of Ecology and Evolutionary Biology.

“There’s climate. There’s density, which can be thought of as both the total number of individuals in a population or how crowded or spread out individuals are. And then there’s stochasticity, which is this big word that just means variance” or random chance.

CU Boulder scientists Ellen Waddle (left), a PhD student in ecology and evolutionary biology, and Dan Doak (right), a professor of environmental studies, and their research colleagues found "that climate data alone did a pretty poor job of predicting population growth (in small tree populations)."

But whether any of these drivers matters more than the others is a question that has challenged researchers since at least the 1950s, and one that Waddle and her coauthors Mark R. Lesser, Christopher Steenbock and Dan Doak take up in a paper recently published in Ecology and Evolution.

Time and perspective

Researchers have tended to fall into opposing camps with this question, Waddle explains.

“There’s a lot of people that think if we can perfectly predict what the climate’s going to be in an area, we’re going to be able to perfectly predict how that population is going to grow through time. And then you have another set of ecologists that argue, well, it also really matters how many individuals you have in the population.”

Yet in their paper, Waddle and her coauthors come to a less divisive conclusion. By analyzing the rings of two long-lived tree species, Ponderosa pine and limber pine, “we found that climate data alone did a pretty poor job of predicting population growth. We needed to include other drivers (in our predictive models), like competitive density effects and stochasticity, to accurately reconstruct population dynamics over time.”

This means that no individual driver proved more influential than the others. They all mattered.

Which was somewhat surprising, Waddle says, considering the long timescale she and her colleagues were dealing with—many hundreds of years. (The oldest tree they sampled dates back to 1470, half a century before Queen Elizabeth I was born.)

“We're averaging over such a long timeframe that you might be tempted to think that random fluctuations and stochasticity are less important, but this sort of study highlights that that's not always true. There's a lot of uncertainty in how long it's going to take small populations to grow.”

“The most important aspect of our work, to my mind,” adds Doak, professor of environmental studies at CU Boulder and head of the Doak Lab, “is showing that simplifying assumptions we often make about population growth don’t seem to hold up.”

‘The entire history of a tree’s life’

Tree rings, says Waddle, are a gold standard for measuring a tree’s history, one with which most people are familiar. The center, or pith, signifies when the tree established, or secured its roots and became capable of growing on its own, and each concentric ring around it represents a year of growth.

CU Boulder researchers studied small populations of Ponderosa pine (seen here) and limber pine to better understand how drivers such as climate data and competitive density affect growth. (Photo: Wikimedia Commons)

But for their study, Waddle and her coauthors used tree rings—in the form of tree cores, or centimeter-wide rods extracted from living tree trunks—a little differently.

“What we did, which has not been done often, was to core every single tree in the population,” says Waddle, which enabled her and her coauthors to get a clearer picture of how tree populations changed over time than they would have gotten coring only a handful of trees.

“Another way to put it: The tree core data basically allows us to reconstruct annual censuses of population from start (1400s-1500s) through present day because we can know exactly how many individuals were alive in each year and when each individual first established.”

The tree-core samples themselves came from Bighorn Basin, a mountain-encircled plateau region in north-central Wyoming about 500 miles from Boulder. Waddle collected some of the tree cores herself in 2017, while an undergrad at CU, for what turned out to be her first camping experience.

Yet the bulk of the core samples owe their existence to Lesser and Steenbock. Lesser alone cored around 1,100 Ponderosa pines between 2007 and 2008, in hot, sometimes tense conditions.

“We (Lesser and an undergraduate field technician) would start hiking to the first trees of the day typically around 5 a.m. to avoid the worst of the heat,” Lesser recalls. “Trekking up dry streambeds to reach the trees we would encounter multiple rattlesnakes each morning and on one occasion a mountain lion that set us on edge for the rest of the day! Many days we would core fewer than 20 trees due to the low density of the population and the ruggedness of the terrain—getting from one tree to the next often took an hour or more negotiating cliff faces, ravines and steep slopes.”

But the effort, he says, was worth it.

“Coring the trees itself was an incredibly rewarding experience—sizing up the tree to get a sense of its shape and where the pith was and then extracting the entire history of its life!”

Pick a species, any species

This research on small-population growth is no small matter, says Doak, “because all populations start small,” and “understanding what controls the growth of new populations has a new urgency as we try to predict whether wild species can shift their ranges to keep up with climate change.”

“Pick some species you care about,” says Waddle, who is currently writing her dissertation on how mountain terrain affects plant species’ ability to follow their preferred climate. “What I care about might be different than what someone else cares about, but there’s probably a species that matters to you, whether it’s a food species or your favorite animal.

“If we want to help keep those populations on the landscape, we need to know how small populations grow and how they persist.”

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In a recently published paper, PhD student Ellen Waddle and her coauthors provide some clarity on a decades-old problem.

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But how’s the atmosphere there?

Rachel Sauer — Wed, 04 Jun 2025 18:10:46 +0000

But how’s the atmosphere there? Rachel Sauer Wed, 06/04/2025 - 12:10

Rachel Sauer

In newly published research, CU Boulder scientists study a rocky exoplanet outside our solar system, learning more about whether and how planets maintain atmospheres

In June 2019, Harvard astrophysicists discovered a rocky exoplanet 22 light years from Earth. Analyzing data from the Transiting Exoplanets Survey Satellite (TESS), they and other scientists around the world learned key details about the rocky exoplanet named LTT 1445 A b: It is almost 1.3 times the radius of Earth and 2.7 times Earth’s mass and orbits its M-dwarf star every 5.4 days.

What they couldn’t ascertain from those data, however, was whether LTT 1445 A b has an atmosphere, “and that’s a big general question even in our own solar system: What sets how much atmosphere a planet has?” says Zach Berta-Thompson, a �� assistant professor of astrophysical and planetary sciences. “Atmospheres matter for life, so before we go searching for life on other planets, we need to understand a very basic question—why does a planet have atmosphere or not have atmosphere?”

Pat Wachiraphan (left), a PhD student in the CU Boulder Department of Astrophysical and Planetary Sciences, and Zach Berta-Thompson (right), an assistant professor in the department, collaborated with colleagues around the country to study JWST data about rocky exoplanet LTT 1445 A b.

Now, after detailed analysis of data from the James Webb Space Telescope (JWST), a lot more is known—and was recently published—about LTT 1445 A b, whether it has an atmosphere and what its atmosphere might be if it has one. CU Boulder researchers partnered with astrophysicists around the country to build on previous research that ruled out a light hydrogen/helium-dominated atmosphere but could not distinguish between a cloudy atmosphere, an atmosphere composed of heavier molecules like carbon dioxide or a bare rock.

The paper’s first author, Pat Wachiraphan, a PhD student studying astrophysical and planetary sciences, Berta-Thompson and their colleagues analyzed three eclipses of LTT 1445 A b from the JWST, watching the planet disappear behind its star and measuring how much infrared light the planet emits. From this, they were able to rule out the presence of a thick carbon dioxide atmosphere like the one on Venus, which has about 100 times more atmosphere than Earth. This highlights an important aspect of science: Sometimes just as much is learned from understanding what something isn’t as from defining what it is.

“What I think should be the next step, naturally, is to ask whether we might detect an Earth-like atmosphere?” Wachiraphan says.

Not like Venus

LTT 1445 A b is one of the closest-to-Earth rocky exoplanets transiting a small star, Wachiraphan notes, and thus one of the easiest to target when studying whether and how it and similar rocky exoplanets hold atmospheres.

The JWST is more sensitive to atmospheres of transiting exoplanets around smaller stars, and LTT 1445 A b transits one of the smallest known type stars—about 20 to 30% the radius of Earth’s sun.

In November 2020, Berta-Thompson and several colleagues submitted a proposal to the Space Telescope Science Institute, the international consortium that decides where JWST is pointed and for how long, “before the telescope had even launched,” he says. “Scientists from all over the world send in anonymized proposals where we make our case for why (JWST) should spend hours looking at this particular patch of the sky and what we would be able to learn from that.

“A panel reads through the proposals, ranks them, from which a lucky 5% to 10% will be selected as the best possible scientific use of the telescope. It is such a precious resource that we care really deeply that the choices about who gets to use the telescope are made fairly; every minute of its time is accounted for.”

Rocky exoplanet LTT 1445 A b is in a three-star system; the star it orbits is an M-type star, also known as a red dwarf. (Artists' illustration: Luis L. Calçada and Martin Kornmesser/European Southern Observatory)

Studying data from three eclipses sent back by JWST, Wachiraphan, Berta-Thompson and their colleagues were able to chart thermal emission consistent with instant reradiation of incoming stellar energy from a hot planet dayside. “This bright dayside emission is consistent with emission from a dark rocky surface, and it disfavors a thick, 100-bar, Venus-like CO2 atmosphere,” the researchers noted.

“So, you can imagine that if you have a planet that is just a rock, with no atmosphere, it would be hot on day side and cold on the night side, but if it has atmosphere, then the atmosphere could redistribute heat from day to night,” Wachiraphan says.

In the case of LTT 1445 A b, “we were basically putting an infrared thermometer up to the planet’s forehead and learned its average temperature is around 500 Kelvin,” Berta-Thompson says. “The whole planet is like the inside of a hot oven, basically.

Based on the data sent back by JWST, there could be several ways to detect atmosphere on LTT 1445 A b. “We came up with an observation with this planet passing behind its star. When the planet is behind its star, we’d just get light from the star itself, but before and after the eclipse we’d get a little contribution from the planet itself, too.” Wachiraphan explains. “But you can also detect an atmosphere when a planet passes in front of its star. “The starlight coming out could pass through the atmosphere of the planet and get absorbed, and we could observe that absorption.”

More observations are currently planned for LTT 1445 A b, led by other scientists and using this complementary method of observation, Berta-Thompson says—of collecting data as the planet transits in front of its star. “There’s a lot more we can learn using different wavelengths of light and different methods that allow us to more sensitively probe these thinner atmospheres.”

Like the inside of a hot oven

One of the most fascinating questions for researchers studying exoplanets, Berta-Thopson says, is “what does it take for a planet to retain or maintain atmosphere? Learning more about that is an important step in the process toward finding a planet maybe like this one—that has a surface, has an atmosphere, is a little farther away from its star, where you can imagine it has liquid water at the surface. Then you’re asking, ‘Is this a place where life could potentially thrive? Is there a place where life is thriving?”

These questions are so interesting, in fact, that they’ve prompted the formation of the Rocky Worlds Program, with which Wachiraphan and Berta-Thompson will work closely, to support international collaboration on the next phases of exploration of rocky exoplanets using satellite data.

“Using this really magnificent telescope that is the collective effort of thousands of people over decades, let alone the broader community that found this planet, is the kind of thing that is under threat right now,” Berta-Thompson says. “All of this science and this discovery requires a really long, big, sustained investment in telescopes, in scientists, in education.”

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In newly published research, CU Boulder scientists study a rocky exoplanet outside our solar system, learning more about whether and how planets maintain atmospheres.

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Rocky exoplanet LTT 1445 A b tightly orbits its parent star, which in turn orbits two other stars in a three-star system. (Artist's rendering of LTT 1445 A b: Martin Kornmesser/European Southern Observatory)

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What is ‘woke’? Who knows?

Rachel Sauer — Mon, 19 May 2025 13:30:00 +0000

What is ‘woke’? Who knows? Rachel Sauer Mon, 05/19/2025 - 07:30

Bradley Worrell

CU Boulder PhD candidate Benjamin VanDreew’s search for an answer to that question finds that Barbie is, book banning isn’t, and that female Democrats are more likely than male Democrats to be seen as ‘woke’

Is Chick-fil-A “woke”?

Seeing that question posted on Twitter (now X.com) back in 2023 made Benjamin VanDreew ponder: Who decides what qualifies as “woke”?

“I was on Twitter, and for whatever reason, trending that day was the question: Had Chick-fil-A gone woke?” says VanDreew, then an undergraduate at Utah Valley University and now a �� PhD candidate in the Department of Political Science studying American politics. “Seeing that post made me question: Is there a cohesive definition for woke? Or is it just kind of an anything-and-everything term?

CU Boulder PhD candidate Benjamin VanDreew was inspired to research wokeness after seeing a post on X and wondering, "Is there a cohesive definition for woke? Or is it just kind of an anything-and-everything term?"

“I really wanted to put the term to the test, because I think having specific definitions—especially in politics, when people are throwing around buzzwords—is incredibly important,” he adds.

“The term woke seems like it’s taken on a life of its own, so I don’t think anybody has felt the need to elaborate on it or explain it themselves. And if everything can just be tossed onto the pile of what the word means (definitionally), to me it makes the word have less meaning.”

In the absence of any widely recognized definition for woke, VanDreew says he was inspired to investigate how average Americans determine what constitutes “woke.” To do so, he and his coauthors commissioned a polling firm to query a demographic sampling of people nationwide about their own definitions of woke by asking them to choose between a series of two lists, with each list containing one political party, one sexual orientation, one gender group, one religious group, one political figure, one historical event, one profession, one higher education institution, one political movement and one political policy.

Those responses were then coded by whether the respondents self-identified as Republican, Democrat or independent and conservative, moderate or progressive.

The authors detailed their findings in the article “What’s woke? Ordinary Americans’ understandings of wokeness,” recently published in the journal Research and Politics.

Who (and what) made the ‘woke’ list

Politicians who appeared on the selection lists for survey respondents to consider included President Donald Trump, President Joe Biden, Florida Gov. Ron Desantis, former congressman Matt Gaetz, Congresswoman Alexandria Ocasio-Cortez, Senate Majority Leader Chuck Schumer and former Speaker of the House Nancy Pelosi. Specific groups included Antifa, Black Lives Matter, the Ku Klux Klan, Moms for Liberty and the Proud Boys, while specific policies included affirmative action, book bans, pro-life, pro-choice, aid for Ukraine, aid for Israel and admitting fewer immigrants.

“We tried to pick people and things that our survey respondents would be aware of by keeping choices as modern as possible,” VanDreew explains of the survey list selections.

He says forced choices resulted in some interesting decisions when survey respondents had to decide what constituted woke. For example, Ocasio-Cortez and Pelosi were deemed woke by respondents, while Biden and Schumer were not—even though all four are Democrats who share similar politics. That’s likely because Republicans, in particular, tend to associate gender (particularly female) with wokeness, he adds.

Meanwhile, survey respondents placed Trump firmly in the anti-woke camp, but not Desantis—even though he made crusading against woke a part of his failed presidential campaign (famously stating that his home state of Florida is “where woke goes to die.”) VanDreew says while it’s not clear why Desantis did not score higher as anti-woke, it may be that part of his messaging did not resonate with survey respondents.

Left: Protestors at a Jan. 20, 2018, march in Calgary, Canada (Photo: Joslyn MacPherson/Wikimedia Commons); right: President Donald Trump speaks during the 2022 Conservative Political Action Conference. (Photo: Hermann Tertsch and Victor Gonzalez/Wikimedia Commons)

When it came to evaluating groups and policies, respondents deemed the Civil Rights movement, Black Lives Matter, lesbians and being pro-choice as being woke, while Republicans, Proud Boys, the KKK, book bans, aid to Israel and admitting fewer immigrants were judged as being anti-woke.

“We were able to see that partisanship does show up across a lot of these things as far as, if something more associated with the Democratic Party, it’s more likely to be viewed as woke, and if it was Republican-associated it would be viewed as less woke. Also, things that are associated with feminism or LGBTQ are more likely to be considered woke, and things that are conservative related to gender and race were seen more as anti-woke,” VanDreew says.

Reviewing the survey results, VanDreew says there was actually a fair amount of agreement between Republicans and Democrats on specific areas of what was deemed woke, as Democrats joined Republicans and independents in identifying certain individuals, groups and causes as woke.

“What was different was the connotation as to whether they viewed woke as a negative or a positive. It’s an interesting thing that they agreed but also completely disagreed on certain subjects,” he says.

Meanwhile, independents as a whole had much less consistent views, tracking more closely with Democrats when it comes to some considerations, while more closely aligning with Republicans on others, he adds. In particular, independents were generally in agreement with Republicans regarding gender issues, which suggests that the political right has been especially successful in reframing gender progressivism as woke, the authors state in their paper.

Other survey responses showed that those polled generally don’t generally consider the religions, careers or products/companies listed in the survey as especially woke or anti-woke—with one major exception: Barbie.

In late 2023, around the same time respondents were surveyed, the movie Barbie debuted and was recognized for addressing gender and stereotyping issues, which may account for the fact that Barbie placed in the woke category, VanDreew says.

Today’s ‘woke’ is different than yesterday’s ‘woke’

"For the sake of voters, we need politicians on both sides to do a better job about transparency when it comes to woke or other buzzwords, and what they’re platforming."

Based upon the survey results, VanDreew says there are some conclusions that can be drawn about woke. First, the term has undergone a radical transformation in recent years.

“Woke is typically attributed to coming about during the Civil Rights movement, as kind of a discrete way for people to show support for the struggle. It may not have been just the word woke by itself, but it could be terms like ‘stay woke,’” he says.

“That’s where it started, and I would say that definition stuck until more modern times, when we’ve seen it take on a completely different context, which is a confusing and not well-organized context.”

Second, research suggests some on the political right have co-opted the term and used it to include anything deemed politically correct, liberal or “anti-American,” VanDreew says. Despite this conceptual stretching, however, the term remains linked to social justice, he adds.

At the same time, research shows that how ordinary Americans view woke as a whole remains unclear. Given that the research paper determined there are implied meanings and associations with woke—but not a clearly spelled-out definition—VanDreew says it reinforces his belief that politicians on either side of the woke issue owe it to their constituents to explain exactly what they mean when they use the word.

“For the sake of voters, we need politicians on both sides to do a better job about transparency when it comes to woke or other buzzwords, and what they’re platforming,” he says. “I think a better understanding of the word (woke) as it’s used by people in power would only help us as a country. That was my only intention here. I didn’t come at this (topic) trying to be polarizing in any direction; I just came at it with a question and the data led to the published results.”

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CU Boulder PhD candidate Benjamin VanDreew’s search for an answer to that question finds that Barbie is, book banning isn’t, and that female Democrats are more likely than male Democrats to be seen as ‘woke.'

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India and Pakistan once again step back from the brink

Rachel Sauer — Fri, 16 May 2025 16:44:25 +0000

India and Pakistan once again step back from the brink Rachel Sauer Fri, 05/16/2025 - 10:44

Rachel Sauer

CU Boulder historian Lucy Chester notes that the recent tensions between the two nations, incited by the April 22 terrorist attack in Kashmir, are the latest in an ongoing cycle

When a gunman opened fire April 22 on domestic tourists in Pahalgam, a scenic Himalayan hill station in Indian-administered Kashmir, killing 26 people, the attack ignited days of deadly drone attacks, airstrikes and shelling between India and Pakistan that escalated to a perilous brink last weekend.

A U.S.-brokered ceasefire Saturday evening diffused the mounting violence between the two nuclear-armed nations that increasingly seemed on a trajectory toward war. It was the latest in a string of escalations spanning many decades between India and Pakistan, which invariably led to the question: Why does this keep happening?

CU Boulder historian Lucy Chester notes that the recent conflict between India and Pakistan is part of a broader history that includes not only religion, but water, maps and territorial integrity.

Lucy Chester, an associate professor in the �� Department of History and the International Affairs Program, has studied the region and relations between the two nations for many years; her first book, Borders and Conflict in South Asia, explores the drawing of the boundary between India and Pakistan in 1947.

Despite President Donald Trump’s assertion that the origins of the conflict date back a thousand years, “that’s not the case,” Chester says. “I would say it’s mainly about Kashmir, with some additional issues at play this time around that changed the dynamics a bit.”

When more than a century of British colonial rule of India ended in August 1947, the Indian subcontinent was divided into Hindu-majority India and Muslim-majority Pakistan—a bloody, devastating event known as Partition. An estimated 15 million people were displaced and an estimated 1 to 2 million died as a result of violence, hunger, suicide or disease.

The first Indo-Pakistani war ignited two months after Partition, in October 1947, over the newly formed Pakistan’s fear that the Hindu maharaja of the princely state of Kashmir and Jammu would align with India. The Indo-Pakistani wars of 1965 and 1971 and the the Kargil War of 1999 followed, as well as other conflicts, standoffs and skirmishes.

Chester addressed these and other issues in a recent conversation with Colorado Arts and Sciences Magazine.

Question: These decades of conflict are often framed as Hindu-Muslim conflict; is that not the case?

Chester: There’s an older dynamic of Hindu-Muslim tension that definitely plays a role in this, but a significant aspect of the conflict over Kashmir is a conflict over water, which is really important. It has to do specifically with Kashmir’s geopolitical position and how a lot of the water that is important to India, that flows through India into Pakistan, originates in Kashmir.

It was a lot about popular pressure this time—Hindu nationalist pressure—on (Indian Prime Minister Narendra) Modi, which is a dynamic that he has very much contributed to. So, in that sense, it could be framed as Hindu-Muslim tension.

But it’s also about territorial integrity—that’s a phrase that kept coming up—and it’s a very loaded phrase that does go back to 1947 and the kinds of nations that India and Pakistan were conceived of in the 1940s and the kinds of national concerns they’ve developed in the years since.

Question: What role did Hindu nationalism, which has been very much in the news since Modi’s re-election last year, play in this recent conflict?

Chester: Hindu nationalism has been important in South Asia since the late 19th century, certainly, and it’s become more important since the 1930s. It’s one strand of the larger Indian nationalist movement—Indian nationalism was behind the assassination of Mahatma Gandhi in 1948. So, it’s always been there, but Modi, of course, has really ramped it up. For a while he distanced himself from the BJP (the Bharatiya Janata Party political party associated with Hindu nationalism), but he’s since made it very clear that he is very much in line with Hindu nationalist ideals and played on those symbols and those dynamics centered to what Hindu nationalist voters wanted.

Colonel Sofiya Qureshi addresses the media about Operation Sindoor at the National Media Centre in New Delhi May 7, 2025. (Photo: Government of India Ministry of Defence)

This whole idea of Hinduness gets back to the various ways both India and Pakistan are conceived of as nations. Hindutva (a political ideology justifying a Hindu hegemony in India) conceives India as a fundamentally Hindu nation, and that idea has gotten so much more reinforcement from Modi and the national government over last 10 years. So, part of what happened with this awful terrorist massacre two weeks ago is that it created a lot of pressure on Modi to respond in a way that previous Indian administrations haven’t felt they had to respond.

Question: In the recent conflict, India accused Pakistan of perpetrating the attack, which Pakistan denied, and framed the response as a defense of ‘Mother India.’ What does that mean?

Chester: Sumathi Ramaswamy explained it best in her book (The Goddess and the Nation: Mapping Mother India), where she talks about Mother India as this cartographed divine female figure who’s very much identified with the cartographic body of the nation. So, any attack on the territorial integrity (of India) is an attack on this woman, this mother figure.

The (recent) Indian Operation was called Operation Sindoor—sindoor is the red coloring that married Hindu woman put in the part of their hair—a call-out to this idea of Mother India and a call to the nation’s sons to be willing to die for her or to kill for her in this case.

In 1947, with the Partition of British India into India and Pakistan, the conception for many in India was a really tragic carving up of the body of the nation, and for a number of Hindu nationalists, that was a specifically female body. For a lot of people in India to this day, the 1947 Partition is this massive failure and an amputation of key elements of the national body. On the other side in Pakistan, for many it’s this great narrative of victory, but on the Indian side there’s this recurring existential fear that further parts of the country could be carved off this way. I think a big part of why conflict keeps happening is that both sides feel very strongly about defending the national territory because it was torn apart in such a violent way, and I think that fear is just most vividly present in Kashmir.

Question: How does the history of Kashmir in terms of British rule and Partition come into play?

Chester: In terms of British India, there were areas that were directly ruled and areas that were indirectly ruled. The indirectly ruled areas were princely ruled, and this is important because Kashmir was a princely state with a Hindu maharaja and a majority-Muslim population. With princely states, in theory they could decide for themselves whether to accede to India or Pakistan, and the maharaja of Kashmir, most would say he was angling for some kind of autonomy or independence and delayed the decision on whether to accede to India or Pakistan.

In October of 1947, militia groups—almost certainly supported by Pakistan—invaded Kashmir and the maharaja appealed to India for help. India airlifted troops in, because there was no all-weather road efficient for deploying troops, which gives you a sense for both how remote Kashmir was and parts of it still are, and also that there weren’t a lot of infrastructure connections.

So, the first Indo-Pakistan war was in 1947 to 1948, then a second war in 1965 and a third in 1971. This reinforces that fear of the country fragmenting and losing parts of the national body, because it was after the 1971 war that Bangladesh became independent (from Pakistan).

In 1949, India and Pakistan established a Ceasefire Line that became the Line of Control in 1972 with the Simla Agreement. The Line of Control is significant because it’s treated as an international boundary—not de jure (existing by law or officially recognized), but de facto. In 1972, officials came up with a textual description for the Line of Control and they define it up to NJ9842, which is the northernmost point on the map where it ends. The text of treaty says something like, “Proceed thence north to the glaciers.” This territory is so remote, so geopolitically useless, that no one at the time thought spending time to define where boundary line ran was important.

In the mid-1980s, both India and Pakistan sent troops to the Siachen Glacier, creating one of the highest more-or-less permanent military bases at about 22,000 feet. (Photo: Wikimedia Commons)

So, north of NJ9842 is this really undefined area—you’ve got Pakistan-controlled territory, India-controlled territory, China is right there, the Karakoram Pass is right there. What happened in the late 1970s, and possibly earlier even into the late 1960s, was Pakistan began issuing permits to international climbing expeditions, and in the early 1980s Indian troops discovered evidence of these international climbing expeditions. India realized that Pakistan had been exercising a certain form of administrative control over this undefined territory, and that’s what triggered the mid-1980s sending of troops from India and Pakistan to the Siachen Glacier. It includes what I think is the highest more-or-less permanent military base at something like 22,000 feet.

As a map geek, I find it really interesting that maps have contributed in pretty direct ways to these conflicts. One of the really tragic elements is that we know that on the Indian side, 97% of conflict casualties in that area are due to terrain and weather, and we can assume similar numbers on the Pakistani side. You’ve got these two countries fighting this battle, but they’re also fighting Mother Nature. In fact, the 1999 Kargil War happened because Pakistan tried to move some of its troops to a higher altitude where they could overlook an Indian road that supplied these high-altitude posts.

Question: What role did water play in the recent conflict?

Chester: All of the water that feeds the rivers that run downstream into western India and Pakistan originates in that region, which gives it real geopolitical value. One of the things that had me particularly concerned this time was India suspended the Indus Waters Treaty from 1960, which was a really landmark agreement governing the sharing of these waters. Some of these rivers flow through India before they get to Pakistan, and at this point India doesn’t have the infrastructure to turn off the water. But Pakistan has said if India starts building that infrastructure, they will consider it an act of war.

Question: Is there anything that makes you feel even slightly hopeful amid these ongoing tensions?

Chester: Over the last two weeks, both sides have been very carefully walking this fine line between being very visibly seen to acknowledge popular pressure on them to stand up strongly to their adversary, but also making very carefully planned choices that as far as possible avoided uncontrollable escalation. Everyone is keenly aware these are both nuclear-armed powers. I was very concerned that it escalated as much as it did on both sides, particularly in the use of airstrikes, but I think both sides were doing their best to leave themselves and their adversaries an off-ramp.

Part of the significance of (the Kargil War in) 1999 was both sides had just come out of the nuclear closet, so everyone was watching that conflict very closely, but both sides were able to walk back from edge. That gives us a lot of reason to hope and to believe that there are very professional people on both sides—in addition to people who are whipping up popular frenzy—who have a good sense for what the limits are, what signals they can send, and who are saying to the population, “We listen to you, we respect your grievances,” but they also know where the edge is and aren’t crossing it.

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CU Boulder historian Lucy Chester notes that the recent tensions between the two nations, incited by the April 22 terrorist attack in Kashmir, are the latest in an ongoing cycle.

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When the homework is happiness

Rachel Sauer — Fri, 09 May 2025 13:30:00 +0000

When the homework is happiness Rachel Sauer Fri, 05/09/2025 - 07:30

Clint Talbott

June Gruber’s Science of Happiness course doesn’t map the way to unmitigated joy; on the contrary, the science of emotional wellness is more nuanced, and her students are sharing this message outside the classroom

The Declaration of Independence famously extols the “pursuit of happiness.” But what, exactly, is happiness, and how should one pursue it? Also, should we even view it as something to be pursued?

Those questions underlie countless magazine articles, TV documentaries and self-help courses. More rigorously, they’re the focus of a popular Science of Happiness course taught by June Gruber, a professor of psychology at the ��.

Gruber’s course does not unfold a map to unmitigated delight. Rather, Gruber’s course pores over the developing research—some of it Gruber’s own—that reveals a more nuanced view and even a “dark side to happiness.” The course also asks students to summarize and share the science of happiness for “outreach” to general audiences.

June Gruber (front row left, checked blazer) and her Science of Happiness students pause for a class photo on the last day of the semester. (Photo: June Gruber)

As Gruber has shown in her peer-reviewed research, a TEDx talk and this CU Boulder course, it is not that happiness is bad. Rather, evidence suggests that happiness is one of several human emotions to which people should be open, and excesses of apparent happiness can signal problems such as mania (or bipolar disorder), excessive spending, problem gambling or high-risk sexual encounters.

Perhaps counterintuitively, Gruber cites a growing body of evidence that the act of pursuing happiness can leave the pursuers, paradoxically, less happy. They report being less able to be emotionally present in moments that could be happy, and they are more likely to experience mood difficulties and anxiety. That’s one “dark side” of happiness.

New evidence for old advice

As it happens, modern science reflects ancient wisdom. In the final class of her spring 2025 semester, Gruber showed her class a quotation from the Rev. Dr. Martin Luther King Jr., who said, “Those who are not looking for happiness are the most likely to find it, because those who are searching forget that the surest way to be happy is to seek happiness for others.”

The English philosopher John Stuart Mill, whom Gruber quotes, said, “Those only are happy who have their minds fixed on some object other than their own happiness: on the happiness of others, on the improvement of mankind, even on some art or pursuit, followed not as a means, but as itself an ideal end. Aiming thus at something else, they find happiness by the way.”

And that “pursuit of happiness” phrase from the Declaration of Independence was lifted from the philosopher John Locke, who said the “highest perfection of intellectual nature lies in a careful and constant pursuit of true and solid happiness; so the care of ourselves, that we mistake not imaginary for real happiness, is the necessary foundation of our liberty.”

Locke himself was influenced by Aristotle and Epicurus, who viewed happiness as a laudable goal but who defined happiness as leading a purposeful and contemplative life. Happiness, Aristotle said, “is the meaning and the purpose of life, the whole aim and end of human existence.”

Gruber discusses this older concept of happiness, sometimes called eudaimonic wellbeing, vs. hedonic wellbeing. Unlike purposeful and meaningful experiences, hedonic pleasures, which tend to be those people in Western societies equate with happiness, are peak experiences, like watching a stunning sunset or blissing out to the “Ode to Joy.”

Putting lessons into practice

In addition to reviewing researchers’ findings and ruminating on ancient wisdom, students in the Science of Happiness course (PSYC 4541) complete weekly “science-to-life” exercises, which apply the theories and practices learned in class to everyday existence.

For instance, students kept gratitude journals, performed random acts of kindness and completed the UPenn Authentic Happiness Inventory. Students also took “awe walks,” in which they visited novel, physically vast spaces and observed their surroundings mindfully.

Beyond the exercises and coursework, the students also have done outreach projects, the goal of which is to share the science of happiness outside the classroom and in the broader community.

One student, Franco Devecchi, produced a flyer highlighting research on the potential benefits of music therapy for those with autism. The flyer cites studies showing evidence that music therapy can strengthen autistic individuals’ sense of well-being, helping them feel more confident, accommodated and socially acceptable.

Devecchi conversed with people in campus buildings in which he distributed the flyers. In one case, Devecchi spoke with another person with autism, recalling, “We bonded over how developmentally important music was for us growing up and discussed the gap in research when it comes to autistic adults!”

Another student, Indiana Wagner, completed an outreach project on the intersection of awe, psychedelics and well-being. Wagner made a presentation to Naropa University’s Intro to Psychedelics Studies course.

Wagner noted that the transformational mechanisms of awe (which can foster happiness) “have a lot of crossover with the transformational mechanisms of the psychedelic experience.”

Wagner added, “Both awe-inducing experiences and psychedelic experiences have the ability to create a sense of ‘mystical experience,’ which can be followed by these transformations; there's a lot of interesting literature, particularly within Johns Hopkins University, on the mystical experience from psilocybin being associated with positive changes.”

Wagner said many of the Naropa students seemed very interested after the presentation and asked questions relating to the subject of awe, how to incorporate it, practice it and Wagner’s own experiences with it.

And student Kate Timothy produced an outreach project on the relationship between sleep, happiness and well-being. Timothy, who completed an honors thesis about sleep disruptions and their effect on Alzheimer’s biomarkers, wanted to further understand how sleep affects well-being and share that knowledge with others.

She developed a trivia event for college students in which the questions focused on how to improve sleep and thus happiness. Timothy is a dormitory worker, and her audience was the dormitory population. “I just asked students as they went by some trivia questions and also passed out some chocolate prizes,” she said. “It was a fun and easy way to get important information about sleep to my peers!”

Gruber has been recognized for her teaching. She is a President’s Teaching Scholar, has won the Boulder Faculty Assembly Teaching Excellence Award, the UROP Outstanding Mentor Award and the Cogswell Award for Inspirational Instruction. The last award is named for and funded by Craig Cogswell, a three-time alumnus of CU Boulder, who says Gruber is an “amazing educator and teacher.”

Gruber also has developed a free online Coursera #TalkMentalIllness course to tackle stigma and mental health and has written articles for Teaching Current Directions in Psychological Science about the importance of teaching students about the positive side of psychological disorders. She also shares career and professional advice for students in Science Careers. She is currently co-authoring a textbook on the science of happiness with Dacher Keltner and colleagues at the Greater Good Science Center at UC Berkeley.

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