The Pulse

WHYY

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Science
Updated weekly

Go on an adventure into unexpected corners of the health and science world each week with award-winning host Maiken Scott. The Pulse takes you behind the doors of operating rooms, into the lab with some of the world's foremost scientists, and back in time to explore life-changing innovations. The Pulse delivers stories in ways that matter to you, and answers questions you never knew you had.

14 hr ago

Chasing Wildlife: From the Golden Toad to Giant Elephants

When twin brothers Trevor and Kyle Ritland were children, their father — a biologist — would tell them stories about a mythical creature that lived high in the misty mountains of Costa Rica: the golden toad. The toad was elusive, he told them — but for a few weeks every spring, hundreds of them would emerge from the shadows to mate, lighting up the dense forest like brilliant spots of fire. Until one day, the golden toad vanished — never to be seen again. It’s mysteries like these that have drawn scores of researchers out of their labs and into the wild — tugging them to explore, to climb distant mountains, to venture into faraway forests and discover or rediscover a creature, a place, some new clue. On this encore episode, we hear stories of those adventures. We talk with Trevor and Kyle about their quest to find out what happened to the golden toad — and what they ultimately discovered. We hear the epic tale of writer Kim Frank’s travels to India in search of wild Asian elephants. And we talk with conservation ecologist Ryan Almeida about how the global wildlife trade is affecting certain species and their habitats. We talk with brothers Kyle and Trevor Ritland — a writer and documentary filmmaker, respectively — about their search for the mythical golden toad, a presumed-extinct species that hasn’t been seen for over three decades, and what they learned in their travels through the cloud forests of Costa Rica. Their book is “The Golden Toad: An Ecological Mystery and the Search for a Lost Species.” About 10 years ago, writer Kim Frank set out to understand why wild elephants were trampling people in India. But her journey and the human-wildlife conflict was far more complex than she imagined — taking her down dead ends, meeting with an Indian princess, and finally coming face-to-face with the forest giants. They’re the kind of animals you only expect to see in documentaries — green anacondas; giant alligator snapping turtles; even the deadly black mamba — but around the world, millions of these often-dangerous animals are sold as pets. We talk with conservation ecologist Ryan Almeida about what fuels the wildlife trade, its effects on native habitats, and what happens when these pets escape into new ecosystems.

50 min
2 Jul

From Buzz to Burnout: How Alcohol Affects the Brain and Body

At the best of times, alcohol makes us feel great — relaxed and gregarious, warm and fuzzy, happy and confident. But at the worst of times, it can morph into a serious problem, damaging our relationships, our health, and our lives as a whole. On this encore episode, we explore our relationship with alcohol. Why we consume it, how it affects us, and when it’s time to quit. We talk with surgeon and recovering alcoholic Charles Knowles about how booze affects our brains and health, and what finally pushed him to give up alcohol for good; we hear about a trend known as “California sober,” and why so many people are embracing it; and we find out how zero-proof cocktail bars are helping some people socialize without the booze. Charles Knowles was barely a teen when he discovered the power of alcohol to transform him from a shy outsider into the life of the party. But as he got older, and sank deeper into drinking, alcohol stopped being fun — and started affecting his health and his life. We talk with Knowles, a surgeon and physician, about what makes some people more vulnerable to problematic drinking, how alcohol affects our brains, and how his life changed once he stopped drinking. Knowles’ book is “Why We Drink Too Much: The Impact of Alcohol on Our Bodies and Culture.” For a lot of former drinkers, “sobriety” means total abstinence — no alcohol, or any other substances that produce a similar buzz. But recently, a new, more permissive version of sobriety has been gaining popularity: “California sober.” It involves embracing cannabis and psychedelics as a means of avoiding alcohol and hard drugs. Reporter Andrew Stelzer tracks the origins of this phenomenon, why some people find it helpful, and what researchers have to say about it. One of the hardest parts about sobriety for a lot of people is dealing with the social impact. Not only is alcohol a social lubricant — it’s often at the center of social events themselves. But recently, some entrepreneurs have been creating alternatives in the form of zero-proof cocktail bars. Pulse reporter Alan Yu visits Philadelphia’s Bar Palmina to find out who goes there, and why.

50 min
25 Jun

How Science and Ingenuity Built Early America

Two hundred and fifty years ago, Philadelphia was not just the center of political revolution, but a hub of scientific discovery. For America’s founders, science was more than a pastime — it was a way of understanding the world and the natural laws that shaped it. On this episode, we explore how science and innovation helped give birth to a new nation. We visit the American Philosophical Society in Philadelphia to explore how tracking the transit of Venus in 1769 became a major success for astronomers in the colonies, one that put American science on the map. We’ll also hear about efforts to find the exact location of the observatory that once stood near Independence Hall — the place some people say was the location where the Declaration of Independence was read out loud for the first time. The first sentence of the Declaration of Independence cites, “Laws of Nature and of Nature's God,” but what exactly does that mean? Caroline Winterer, Professor of History and American Studies at Stanford University joins us to discuss the ideas that allowed the Founders to bridge the gap between physical science and political governance, effectively inventing our modern concepts of society and inalienable rights. We dive into the story of the "Turtle," the first submarine used in combat which was invented during the Revolutionary War. Reporter Alan Yu explains the many innovations contained in this small vessel, and its daring first mission. Then Host Maiken Scott travels to The International Spy Museum in Washington, D.C., to see a replica of the craft. We head into the kitchen with three prominent Black Philadelphia chefs, Omar Tate, Angie Brown, and Shola Olunloyo, to reconstruct an iconic dish that fueled the revolution: Philadelphia pepper pot soup. Reporter Justin Kramon tells the story of this dish, and how people are keeping its memory alive.

1hr 3min
18 Jun

The Body Remembers: Exploring the Invisible Wounds Left by Serious Illness

On this episode, we explore the lingering effects of medical crises, both physical and emotional, and what true healing really means. We hear about one doctor’s journey to reconnecting with her body — and her pain — after nearly dying, what researchers are learning about medical trauma, and how a traumatic brain injury transformed the lives and marriage of a couple. As a physician, Rana Awdish’s goal was to get her patients healthy as quickly as possible. But when she experienced her own medical emergency — one that ended her pregnancy and nearly killed her — her perspective on the role of clinicians shifted. Awdish later wrote a memoir about her experience, “In Shock,” that explored the importance of not only healing patients, but connecting with them on an emotional level. But the story didn’t end there. Fellow doctor and podcast host Neda Frayha talks with Awdish about her continuing journey, in the wake of the book’s success, to realizing that she hadn’t fully healed from her medical crisis, and that just as clinicians needed to connect with their patients, she needed to connect with her own body. Awdish’s new book is "After Shock: Learning to Reinhabit My Body After Illness." We talk with psychologist Jim Jackson about his decades-long work on medical trauma — the invisible psychological scars that many patients experience after serious illness or injuries. We hear about the causes of medical trauma, helpful and harmful ways of responding to it, and treatment options. His new book is “Reclaiming Your Life from Medical Trauma: Recognize the Symptoms, Find Treatment That Works, and Heal Your Brain and Body.” Medical crises don’t just affect patients — they affect their loved ones too. Pulse reporter Liz Tung talks with writer Abby Maslin and her husband T.C. Maslin about dealing with the fallout of an assault that almost killed T.C., and left him with a traumatic brain injury. They explore the effects on their lives and marriage — and dealing with cognitive and personality changes that made Abby feel like she was married to a stranger. Her book on their experience is “Love You Hard: A Memoir of Marriage, Brain Injury, and Reinventing Love.”

50 min
16 Jun

You’ve Heard of ‘Dad Bod’ But How About ‘Dad Brain?’

We often talk about the biological and emotional transformation of motherhood, but what happens to men’s brains when they become fathers? On this episode, host Maiken Scott chats with psychologist and researcher Darby Saxbe to explore her new book, “Dad Brain: The New Science of Fatherhood and How It Shapes Men’s Lives.” While the "dad bod" is a common trope, Saxbe’s research reveals that the changes go much deeper. Drawing on longitudinal studies, she explains how fatherhood triggers a biological reorganization — including measurable changes in brain volume within the social cognition network and dynamic shifts in hormones like testosterone and prolactin. Far from being "damage," these changes are an adaptive process, streamlining the brain to help fathers process social information and bond with their children.

42 min
11 Jun

How Music Shapes Memory, Emotion, and Imagination

Music can transport us to a different time and place — but how does that happen? We explore how music affects our brains — from its ability to tap into our memories and imaginations, to “musical daydreaming” and how it helps us understand both the world and ourselves. We also discuss the therapeutic power of music. We talk with Elizabeth Margulis, director of the Music Cognition Lab at Princeton University, about how music affects our brains, and how it helps us make meaning and sense — both of ourselves, and of the world. Her new book is “Transported: The Everyday Magic of Musical Daydreams.” We listen back to an interview with musician and neuroscientist Daniel Levitin about music's ability to engage our brains, its close link with physical movement, and its function — both therapeutically, and in human evolution. He’s the author of “I Heard There Was a Secret Chord: Music As Medicine.”

50 min
4 Jun

When Healthcare Meets the Law: Abortion, Cannabis, and Corporate Medicine

On this episode, we look at the intersection of health, medicine, and the law. We explore how the upcoming rescheduling of marijuana may impact research on the drug, hear the story of a doctor who faced manslaughter charges in the 1970s for providing an abortion, and learn about legislation that some states are using to try and keep private equity out of medicine. Near the end of 2025, President Donald Trump made an announcement that marijuana advocates had been waiting decades to hear — plans by the federal government to move cannabis from schedule 1 to schedule 3, a much less restrictive legal category that would allow scientists to more easily conduct research on the drug’s therapeutic value. Pulse reporter Liz Tung digs into the history of how cannabis first became a federally illicit drug, what impact that status has had on research, and how much of a difference rescheduling will really make. We talk with Britt Carpenter, a recovery advocate and executive director of Philly Unknown Project, about how medical marijuana helped him get off opioids after years of addiction — and how the stigma against marijuana may prevent others from doing the same. Abortion has been in a state of legal flux ever since the U.S. Supreme Court overturned Roe v. Wade, putting many providers at risk of criminal prosecution. That might seem like a new development — but doctors faced similar pressures in the tumultuous years after Roe v. Wade was first decided. Reporter Linda Marsa tells the story of one young physician named Kenneth Edelin who became a national focal point of the debate after facing manslaughter charges for performing an abortion. It seems like a simple, common sense idea — that medical decisions should be made by doctors, not investors. But it’s an idea that’s been increasingly under threat, thanks to the rise of private equity in medicine. Now, some states are pushing back, with legislation aimed at curbing corporate influence in healthcare. Pulse reporter Alan Yu breaks down a recent court case out of Oregon that tested one such law, how it was decided, and what it could mean other states moving forward.

50 min
28 May

Engineering Happiness into Our Daily Lives

Think about the last time you were really happy — where were you? What were you doing? Who were you with? And, most importantly, how can you recreate that feeling? Happiness can feel like lightning in a bottle — beautiful in the moment, but hard to find and harder yet to sustain. So what is it that makes for a happy life? And how do we engineer our lives for greater contentment, fulfillment, and joy? On this encore episode: the science of happiness and how we can experience more of it every day. We talk with psychologist Eric Zillmer about why certain places bring us joy, and how to engineer happiness in our lives. We hear about one reporter’s experiment to bring more moments of serendipity in her life. And, writer Daniel Coyle explains why community is at the heart of what it means to flourish. Drexel University psychologist Eric Zillmer created a “happiness map” of Philadelphia with the help of his students. He says it holds greater lessons on why certain places bring us joy, and how we can reverse-engineer happiness into our days. Zillmer directs the happiness lab at Drexel University. Writer Daniel Coyle built his career on exploring what it is that makes people successful — but when both of his parents died a few years ago, Coyle found himself unmoored, questioning what makes for a happy and meaningful life. The resulting journey led to his newest book, “Flourish: The Art of Building Meaning, Joy, and Fulfillment.” We talk with Coyle why he says community is at the heart of flourishing, how to create the right conditions for happiness, and why he says life isn’t a treasure hunt — it’s the process of treasure creation.

50 min

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Maiken Scott

Host

Go on an adventure into unexpected corners of the health and science world each week with award-winning host Maiken Scott. The Pulse takes you behind the doors of operating rooms, into the lab with some of the world's foremost scientists, and back in time to explore life-changing innovations. The Pulse delivers stories in ways that matter to you, and answers questions you never knew you had.