Each of our cells can become cancerous. It’s an uncomfortable, yet unavoidable truth. Nor is it a truth restricted to our species - cancer is a consequence of complex life. The features that make a cell cancerous are those that, under other circumstances, are beneficial, essential even, for an individual’s growth and survival. How is that possible? In the second installment in our series, we’re putting cancer under the microscope to consider the qualities that underlie a cancer cell’s success in our body. By placing cancer in an evolutionary framework, we can not only understand why cancer is so darn prevalent, but we can also leverage that knowledge to devise new approaches to treatment - working with evolution rather than against it. If you’ve ever wondered why we haven’t come up with a cure for all cancer or why some animals get cancer more than others, this is the episode for you.

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Cancer has touched every one of us in some capacity, and learning of a diagnosis inspires many more questions than it answers. In this four-part series on cancer, we aim to lay a foundation of knowledge that will help make sense of this multifaceted disease. We begin our four-part series on cancer by asking a deceptively simple question: what is cancer? As we’ll discover over the course of these episodes, there is not one answer but many. After all, cancer is not one disease but many. In this first episode, we examine the clinical definitions of cancer - when someone receives a cancer diagnosis, how is that determined, and what does that mean? Viewing that question through a historical lens reveals our changing understanding of cancer and how that knowledge filters into the public perception of this disease. With cancer diagnoses on the rise, it’s tempting to label cancer a disease of the 20th or 21st centuries. But is that the case? Tune in to find out.

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What happens if you put a bunch of rats in an enclosure and provision them with unlimited food and water? Researcher John B. Calhoun was committed to finding out. Results from Calhoun’s “rat utopia” experiments from the mid-20th century revealed a behavioral dark side that emerged as space grew increasingly limited, ultimately leading to complete population collapse. As headlines conveyed dire warnings about global overpopulation, Calhoun’s work served to reinforce those fears and shape our understanding of the importance of personal space. In this week’s TPWKY book club episode, Jon Adams and Edmund Ramsden join me to discuss their book, Rat City: Overcrowding and Urban Derangement in the Rodent Universes of John B. Calhoun. Tune in for a fascinating a tour through Calhoun’s bizarre and influential research, which even inspired a beloved (if a little creepy) children’s book and movie, Mrs. Frisby and the Rats of NIMH.

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Poop is an incredibly valuable and massively underutilized resource. However, most of us don’t see it that way because of our evolutionarily ingrained disgust towards poop. Flush toilets and intricate sewer systems have revolutionized health and hygiene by whisking our poop far away where we don’t have to think about it. But that poop has gotta go somewhere, and eventually, not thinking about it isn’t going to be an option. Similarly, not thinking about our individual poop is asking for disaster, since what we produce can reveal a great deal about our gut and overall health. In this episode, we explore the problems that poop can cause on both the individual and population level. From constipation to fiber, and the Great Stink to communal poop sponges, we’re continuing our journey into the curiously fascinating world of poop.

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It might be stinky and it might be unpleasant to behold, but we all do it. For many of us, our poop is out of sight, out of mind once we flush it away. But for the next hour and fifteen minutes or so, we’re going to bring it back into mind as we delve into the rich world of poop. This episode, the first of a two-part miniseries on poop, features a wide cast of characters all with some role in the production or management of poo, like our intestinal tract with its sphincters and microbiota, dung beetles that perform the duties so crucial for ecosystem function, and the sperm whale that produces a revered substance used in perfumes. We’re going behind the scenes to understand how the sausage really gets made (in a manner of speaking) and why we need a big perspective shift to stop seeing poop as waste and start seeing it as a resource.

Correction: EW says that elephants poop 15 pounds a day, but in reality it’s more like 10x that - 150-200 pounds! Sorry for the mistake - we noticed it while listening through.

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For much of the world, refrigeration is such a commonplace technology that we rarely stop to wonder at the many ways it has transformed our lives. From the foods we grow to where we grow them, from how they taste to what we eat, refrigeration has dramatically - and quite recently - changed our relationship to food, our health, and the environment. As Nicola Twilley describes in Frostbite: How Refrigeration Changed our Food, Our Planet, and Ourselves, progress, as it so often does, comes at a cost. Twilley, who also cohosts the award-winning food podcast Gastropod, joins us in this week’s TPWKY book club episode to discuss the surprising history and tenuous future of refrigeration. You’ll never look at your fridge the same way again.

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Now that we know just how critical sleep is, we’re all making sure we get the amount we need, right? Unfortunately no. One-third to one-half of Americans are not getting enough sleep, according to public health guidelines. Why is that? Hypotheses abound, but many point the finger of blame at different aspects of modern society such as screen time, artificial light, a sedentary lifestyle. These narratives suggest that sleep in industrialized societies today is not just different but worse than in centuries past. Is that the truth? How did humans sleep in yesteryear, and what can that tell us about sleep today? In the conclusion to our sleep two-parter, we explore the many ways that humans sleep and the wide array of consequences when we don’t get enough (or too much) of it.

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Sleep is a universal experience. It’s not just the lion that sleeps tonight - it’s also the butterfly, the chicken, the jellyfish, the dog, the snake, the worm, and of course the human. What is this widespread physiological process whose spell we are all under? What purpose (or purposes) does it serve? Why do we sleep the way we do? These are just some of the questions we’re going to get into in this week’s episode, the first half of our two-parter on sleep. We break down the different components of sleep in humans before diving deep into how animals sleep and what drives the different patterns we see. Night owl or daybird? Light sleeper or deep slumberer? Frequent naps or one big chunk? One eye open or both eyes closed? Tune in as we unravel some of the mysteries of sleep.

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The widespread use of leaded gasoline in the 20th century led to one of the world’s biggest public health and environmental disasters, the effects of which are still present today. Since its development in the 1920s, leaded gasoline has been linked to premature death, cognitive impairment, and behavioral issues in millions around the globe. How was such a toxic substance permitted to be sold, despite the tireless efforts of industrial medicine warriors like Alice Hamilton? In American Poison: A Deadly Invention and the Woman Who Battled for Environmental Justice, award-winning author and historian Daniel Stone tells the story of leaded gasoline - its heroes, its villains, and the lessons we can learn. What will emerge as this generation’s leaded gasoline? PFAS? Microplastics? Something else entirely? History doesn’t have to repeat, but it will unless we heed the lessons of the past. Tune in for a fascinating episode!

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Ah, the new year. After the last month and a half of indulgent food and drink, disrupted schedules, and laying around the house, who doesn’t feel like they’re in need of a whole-body cleanse? There are plenty of companies who are more than happy to provide that product or service that promises to flush away toxins from your skin, gut, blood, brain, you name it. But what exactly are they selling you? In this episode, we explore the deep roots of the ever-expanding detox industry and the concept behind its billions of dollars in revenue: detoxification. What does detoxification even mean? Is there any truth to the claims that a certain diet or superfood or supplement or colonic or drink or enema or chelation therapy can “detoxify” you? Tune in to find out how many synonyms for scam we can come up with.

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This episode originally aired on January 11th, 2022.

Chances are you know someone with endometriosis, or perhaps you’re affected yourself. But despite its incredibly high prevalence, endo remains almost criminally understudied, undertreated, and underacknowledged. In this episode, we aim to shed light on many aspects of endometriosis, first by examining the “what” and “how” of this disease: what’s actually going on inside your body with endometriosis and how does it cause the symptoms that it does? Then we turn our sights to the why, exploring not only the possible evolutionary origins of this disease but also the deep historical roots contributing to the struggle many people still face today in obtaining a diagnosis. We discuss how although hysteria is no longer a valid medical diagnosis, it has left its mark on medicine in the form of implicit bias that leaves many people feeling unlistened to and unbelieved. We then wrap up the episode with a look at endometriosis by the numbers and some current research that leaves us feeling slightly more hopeful about the growing awareness of this disease and the need for effective treatments.

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This episode originally aired on January 25th, 2022.

In light of the recent changes by RFK jr’s Advisory Committee on Immunization Practices (ACIP) to eliminate the universal birth dose of the hepatitis B vaccine in the US, a decision which will result in preventable infections and deaths in this country every year, it seems timely to remind everyone of the global consequences of this incredibly prevalent pathogen.

This week, we’re dipping a toe back into the vast waters of hepatitis viruses, this time with a focus on hepatitis B. The hepatitis B virus, though second to be named, was first to be discovered, and effective vaccines and treatments have been available for decades. Yet the global prevalence of this virus remains staggering, with nearly 300 million people chronically infected and 1.5 million new infections annually. So what’s going on? In this episode, we weave our way through the complicated biology of this virus and its deadly potential, the strange history of its identification that shows that you don't have to be looking for something to find it, and the current status of this virus that underlines how safe, effective tools for disease prevention are only as good as our delivery infrastructure. We are also so excited to be joined by Dr. Su Wang, Medical Director for the Center for Asian Health & Viral Hepatitis Programs at the Cooperman Barnabas Medical Center and outgoing President of the World Hepatitis Alliance.

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Did your grandma ever warn you against going out in the cold with wet hair because “you’ll catch your death”? Or have you ever tossed a few more carrots into your shopping basket in the hope that they’ll improve your vision? There are countless health myths about how to prevent or treat disease, what food will give you superhuman powers or turn your kid into a whirlwind of energy. But is there any truth to them? Let’s find out. In this episode, we review a handful of the most popular health myths, exploring their origins and scouring them for any scrap of truth. Tune in to learn whether these myths are fact, fiction, or somewhere in between!

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[Content warning: self-harm, suicide, violence]

In this day and age, we are equipped with an abundance of tools and knowledge to fight the spread of disease. Yet what good does that toolkit do if we lack the resources or the will to implement it where it is needed? One area of great need is our correctional facilities, our prisons, jails, immigration detention centers, and juvenile detention centers. In these settings, communicable disease is often allowed to spread unchecked, leading to high rates of morbidity and mortality. Meaningful change is needed, but what might that look like? In this week’s TPWKY book club episode, Dr. Homer Venters joins us to discuss his latest work, Outbreak Behind Bars: Spider Bites, Human Rights, and the Unseen Danger to Public Health. As the former Chief Medical Officer of the New York City jail system and through his current role as a federal monitor of health services in several jail and prison settings, Dr. Venters has extensive firsthand knowledge of the barriers that prevent adequate medical care to be delivered to these populations. And he has evidence-based solutions. Tune in for a necessary discussion of this humanitarian crisis.

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We ended last week’s episode on a bit of a cliffhanger: is salt actually bad for us and if so, why does there still seem to be a debate? This week’s episode holds all the answers. We’re sifting through the noise to figure out what salt actually does in our bodies, how it might impact our health, and why we crave this delicious substance. If you’ve ever wondered how we’ve arrived at the maximum daily sodium intake (2300 mg for adults) and why salt impacts blood pressure, then this is the episode for you!

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Have you ever thrown a pinch of spilled salt over your left shoulder? Or said to someone “well, take his opinion with a grain of salt”? Or looked up the potential salary of a job listing? Salt is so deeply embedded in our cultures, our languages, our history as a species that we often take its influence for granted. We may forget (or perhaps we never knew) how much history is held within the unassuming yet ubiquitous salt shaker. In the first installment of this two-parter on everyone’s favorite seasoning, we delve deep into some salt lore. When did humans start to ramp up their salt intake? Why was salt such a big deal? Which places are named for salt? When did we start worrying about how much sodium we were eating? Tune in for a fun, fact-filled episode that’ll forever change the way you think about salt.

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In an anatomy and physiology class, you may learn how the different heart valves work to circulate your blood, how the structure of your kidney helps to maintain electrolyte levels, and how the expansion and contraction of your lungs sets off a carefully orchestrated cascade of gas exchange and transport. The human body is an endlessly fascinating machine. But when you spend so much time learning about the body, you can lose sight of the fact that it isn’t a machine. It is the story of your life. In this book club installment, I am joined by surgeon and award-winning writer Gabriel Weston to discuss her latest book Alive: Our Bodies and the Richness and Brevity of Existence. In this compelling blend of memoir, science, and meditation, Weston examines different body parts chapter by chapter - what they have meant to her or her loved ones, their significance in history, and how their meanings are shaped by our scientific understanding. Weston inspires readers to take a moment to reflect on what it’s like to live in your body, feel your heart beat, your lungs expand. Doing so can help us connect with ourselves and others. Tune in for a delightful conversation!

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If you were asked to describe necrotizing fasciitis in three words, you might choose: rapid, deadly, and rare. The third of those adjectives may provide some comfort, but the first two are the clear inspiration for this infection’s more lurid nickname: flesh-eating bacteria. In this episode, we get up close and personal with necrotizing fasciitis and its causative agents. We start off by examining step by step how these infections wreak so much havoc and why doctors still struggle with its treatment. Then we take a tour through its grisly history, featuring maritime misadventures and wicked war wounds. We wrap up the story with a look at the global trends in these infections as well as some promising new research. This episode may not be for the faint of heart, but it is for the endlessly curious.

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It’s the stuff nightmares are made of. A fly lands on an open wound and lays hundreds of eggs, from which hatch countless ravenous maggots. There they writhe, devouring flesh, insatiable and relentless. Every minute they dig deeper and deeper until flesh gives way to bone. Even the species name of these maggots inspires a shiver of fear: Cochliomyia hominivorax - “man eater”. This nightmare of a fly is the horrifying reality for many mammals in South America and some Caribbean islands, particularly cattle. And it seems to be making a comeback in the places it was previously eradicated - Central and North America. What exactly this fly does, why it’s such a problem, and how we came to defeat it (temporarily) all feature in this week’s episode. Sterile flies? Archival footage? Gnarly descriptions? This episode has it all.

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Science doesn’t always get it right the first time (or the second, or the third, or even the ninety-ninth!). And while we may chuckle at the outlandish things people believed or the goofy experiments they tried, we forget two things: 1) those failures helped us get where we are today and 2) a hundred years from now, people will probably be laughing at the “cutting edge” medical knowledge of today! In this week’s book club episode, Erin and I chat with two of our all-time favorite science communicators, Dr. Lindsey Fithzarris and Adrian Teal to discuss their newest book Dead Ends!: Flukes, Flops & Failures That Sparked Medical Marvels. This hilarious and insightful book, geared towards middle-school readers (but enjoyable for all ages!), frolicks through some of the strangest stories in the history of medicine, accompanied by delightfully grotesque illustrations. There’s learning, there’s laughter, but most importantly, there’s a lesson: failure is okay. Not just okay but a necessary part of science. Tune in for all this and more!

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As we learned last week, starvation extends far beyond hunger and what a lack of food does to the human body. Similarly, famine is much more than a food shortage and starvation on a population-level scale. This week, we’re picking up where we left off last episode to explore the definitions, drivers, and many dimensions of famine. We trace famines throughout human history, asking how they have changed either in their incidence, severity, or cause. No two famines are exactly alike, but taking a bird’s eye view of patterns in famine over time gives us insight, especially into the famines of the past 100 years. We conclude the episode with a discussion of the ongoing famine in Gaza and other food insecurity crises in other regions of the world. Tune in for a broad overview of this heavy but incredibly important topic.

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Deprived of food, our bodies do the best they can to keep us alive and functioning as long as possible. As the days pass, the rhythms of our lives change: our metabolism, our heartbeats, our hormones, even our thoughts shift to adjust to this period of scarcity. This response is evolutionarily engrained, following a variable but fairly prescribed path. In this episode, we trace that path, exploring what happens when our bodies are not given the energy stores they need, how patterns of metabolism alter, leading our bodies to consume themselves, and the profound consequences this has on every part of our physiology and psychology. We also tell the story of how we came to learn about these outcomes, chiefly through a WWII-era study called the Minnesota Starvation Experiment. This is the first of two episodes centered around malnutrition, starvation, and famine. Next week, we’ll explore the broad topic of famine, of which starvation is merely one component.

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The United States is in the midst of a monumental mental health crisis, with one in four people predicted to experience mental illness at some point in their lives. Adequate mental health care remains out of reach of so many due to a myriad of factors: unaffordability, stigma, shame, and racism, to name a few, leaving enormous gaps in mental health equity. The roots of these inequities can be traced back decades, to the earliest psychiatric hospitals founded on harmful racist notions of mental illness. In Madness: Race and Insanity in a Jim Crow Asylum, author and award-winning journalist Antonia Hylton explores the story of Crownsville Hospital, a segregated asylum in Anne Arundel County, Maryland, built in 1911 by its first patients: twelve Black men. Over the course of the 20th century, the shifting perspectives of race and mental illness played out in the overcrowded and understaffed Crownsville Hospital, with powerful implications for understanding our current failing to deliver adequate care to all in need. Madness is a powerful and necessary book that sheds much-needed light on the intersections between race, racism, and mental illness.

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Every year, millions of babies around the world are screened for dozens of treatable conditions within the first day or two of life. What it takes is a few drops of blood on some filter paper, and what it gives is profound: potentially life-saving information. The advent of newborn screening is one of the greatest public achievements of the 20th century; since their earliest implementation, screening programs have diagnosed hundreds of thousands of babies early enough for medical intervention. And the life-saving potential they hold continues to grow with the development of genomic sequencing technology, which will increase the number of screenable conditions by an order of magnitude. In this episode, we explore the serendipitous origins of newborn screening, what the process looks like from a parent’s perspective, and how cutting-edge technology could revolutionize these programs. To help us navigate the exciting future of newborn screening, Dr. Joshua Milner, Professor of Pediatrics and Director of Allergy Immunology and Rheumatology at Columbia University Medical Center joins us to discuss an ambitious research program at NewYork-Presbyterian hospitals titled the GUARDIAN study, or Genomic Uniform-screening Against Rare Disease in All Newborns. Tune in for a truly thrilling episode!

For more on the GUARDIAN study, the groundbreaking research program using genomic sequencing technology to screen newborns at NewYork-Presbyterian hospitals for hundreds of conditions, check out the Advances in Care podcast episode titled “Newborn Gene Sequencing: Expanding Early Detection of Treatable Diseases.”

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None of us are ever truly alone. Our bodies are home to untold numbers of microbes, chilling on our skin, in our guts, throughout our respiratory tract, inside our bellybuttons, under our fingernails, and beyond. For the most part, we live in harmony with these critters, never giving them a second thought. But occasionally, they may grow a bit too friendly, taking advantage of our hospitality to grow and spread with abandon. Candida yeasts are especially fond of this tactic, leading to millions of infections around the globe each year, many of which can cause significant illness or even death. In this episode, we explore the characteristics of these yeasts that make them so prone to overgrowth, how severe infections can develop, and why one of medicine’s greatest achievements may have helped usher in this new fungal era.

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When your car breaks down or your fridge goes on the fritz, you can order a replacement part and get things back up and running in no time. The same cannot always be said for another intricate machine: the human body. For centuries, scientists have grappled with making or transplanting suitable replacements for nearly every body part, from hearts to hair and from legs to lungs. We’ve come quite a long way in that quest, so that at times, it feels as though we’re living in a sci-fi novel, where skin cells are printed and we can grow a customized heart. Yet we still have further to go, thanks to our magnificent immune system, who proves to be quite a worthy opponent. Here to tell you all about the weird and wonderful world of regenerative medicine is the one and only Mary Roach, who joins us this week to chat about her latest book Replaceable You: Adventures in Human Anatomy. As with any Mary Roach production, this is the perfect combination of informative, fascinating, and fun. Tune in today!

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Last week, we took you through all the ways that cold can harm us and the harrowing history of humans perishing at its icy hands. Ending the story there would be skipping over the parts where cold gets to play the hero, rather than the villain. In the second installment of this frosty miniseries, we explore the situations in which we might use cold to protect us and how it actually works. We also delve into the surprisingly long (and unsurprisingly grim) history of therapeutic hypothermia, a journey that wouldn’t be complete without a debate over sea cloaks, a reconsideration of the plot of Titanic, and a brief jaunt into cryonics.

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For all our wondrous adaptations as a species - our big brains, our capacity for language, our opposable thumbs - we humans are not well-equipped to deal with the cold. Take us out of our insulated dwellings, take away our winter clothes, and things can get dicey fast. From frostbite to hypothermia, the cold can settle into our bones, leading us down a path where injury or death are possible outcomes. In this episode, we explore that path: how our meager cold-survival adaptations are vastly outshone by other animal species, the long and grim history of hypothermia in war, and what exactly is happening inside your body when your temperature drops. Tune in to this unexpectedly strange grab-bag of an episode.

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The development of antibiotics was one of the greatest turning points in the history of medicine. Bacterial infections that were once death sentences were cured within a matter of days after administration of these lifesaving compounds. But the honeymoon didn’t last long, as resistant bacterial strains emerged and spread. Now, antimicrobial resistance poses one of the greatest threats to global health; frankly, we can’t invent new antibiotics faster than resistance develops. Fortunately, there may be a solution, one that has existed even before antibiotics came on the scene: phage therapy, the use of bacteriophages to treat bacterial infections. In The Living Medicine: How a Lifesaving Cure Was Nearly Lost—and Why It Will Rescue Us When Antibiotics Fail, author Lina Zeldovich takes readers through the incredible and long-forgotten story of phage therapy and the doctors who developed it. Tune in to learn how phage therapy, after almost being relegated to a footnote in the history of medicine, is reemerging as a possible solution to the deadly problem of antimicrobial resistance.

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Some things just go together: peanut butter and jelly, bacon and eggs, milk and cereal, London and smog. Or at least, that’s the way things used to be until the Great Smog of 1952. (Don’t worry, the first three pairings are safe). If you’ve watched The Crown, you may remember an early episode in which a thick, noxious smog surrounded the entire city of London for days on end. People coughing, hacking, collapsing. Traffic ground to a standstill. Authorities in denial. What was actually going on in December 1952 to lead to such conditions? What was in the smog to make it so toxic? And how did this severe pollution event lead to massive changes in air quality regulations around the world? Tune in to find out all this and more (including what The Crown got wrong).

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For most of us, there probably hasn’t been a good reason for you to think about your gallbladder. Ever. Much of the time, it sits there, silently storing, concentrating, and, when needed, churning out bile every day. But occasionally, this unassuming organ will announce itself through waves of unceasing, excruciating pain brought on by a blockage of some sort. Why it does this to us, what we do about it, and how we can live a gallbladder-free life are just some of the things we cover in this episode. We’re also taking this opportunity to deep dive into the substance most closely associated with the gallbladder: bile. Bile plays an outsized role in the history of medicine, mostly through its role as one of the four humors in the humoral theory of disease. Are you of a choleric temperament or is your vibe more sanguine? Maybe melancholic or phlegmatic suits you better. Don’t know what the heck we’re talking about? Tune in to find out.

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In the first years of the COVID pandemic, a debate raged: was the virus transmitted via respiratory droplets, or was it airborne? For some, this distinction seemed overly technical, pedantic even. But for others, it represented decades of dismissal and missed opportunities - opportunities that had cost untold lives. In this week’s TPWKY book club episode, renowned science writer and journalist Carl Zimmer joins us to discuss his latest book Airborne: The Hidden History of the Life We Breathe, which uncovers the long-forgotten story of an entire field of study - aerobiology - and the pioneering scientists who discovered life where there was thought to be none. Tune in for a fascinating conversation about why airborne transmission matters and the incredible work that some researchers are doing to breathe new life into its study.

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Last week, we took you on a journey of discovery and innovation, and this week we’re gonna tell you how the heck it all works. That means a deep dive into the nitty gritty of SSRIs, from what serotonin does (A LOT, as it turns out), to why blocking its uptake has the effects it does, from the different side effects of SSRIs, to how effective they really are. The discourse surrounding this class of drugs is complicated and contradictory, and this episode provides lots of answers and some terrible baseball metaphors to help you make sense of SSRIs.

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Since first hitting the shelves nearly 40 years ago, SSRIs have become one of the most commonly prescribed classes of antidepressants around the world, as well as one of the most discussed and misunderstood. This and next week, we tell the story of SSRIs in two parts. In Part 1, we explore the origins of these medications and their predecessors, a surprising journey that takes us back millions of years and across the animal kingdom, and one that proves that John Green was right - everything truly is tuberculosis. How did we get from tuberculosis to Prozac? Tune in to find out.

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We’ve got a very special episode of the TPWKY book club this week! We’re featuring our very first fiction book: King of the Armadillos by Wendy Chin-Tanner. This novel tells the story of a young man named Victor, who is sent from his home in New York City to a federal treatment facility in Carville, Louisiana after a diagnosis of Hansen’s disease (then known as leprosy). After being ripped away from his family and the life he knew, Victor struggles to navigate his new situation, facing racism, stigma, and loneliness. Ultimately, he finds support in the lively community of Carville. Wendy joins us to discuss her creative process for this beautifully-written book, and how her father’s life provided the basis for Victor’s story. Tune in for a heartfelt conversation about a long-forgotten piece of public health history and the powerful meaning that diseases can hold.

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What’s in a name? What can you really tell from a label like “polycystic ovarian syndrome”? And how much of that is more misconception than truth? The answer, as it turns out, is the former. In this episode, we delve into the world of PCOS, a world that shows us how preconceived notions of health and disease, gender and sexuality can do far more harm than good. For many people with PCOS, this condition violates society’s expectations of how you should look, act, or feel. And the resulting stigma and shame deepens the silence that often surrounds PCOS and leads to inadequate treatment and medical gaslighting. But thanks to the work of some incredible advocates, that silence is slowly fading. Tune in to discover the many lessons that PCOS can teach us, if only we are willing to learn.

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This episode, we aren’t asking you to taste the rainbow, but we are scrutinizing the artificial dyes that give it its color. When you’re munching on brightly colored candies or dipping a french fry in purple ketchup, what exactly is it you’re tasting? In this episode, we take you through the story of food dyes, from their serendipitous discovery to their enthusiastic overuse, from much-needed regulation to controversial health findings. You’ve read the headlines, now get the full picture of artificial food dyes.

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From the earliest grunts and gestures to the complex sentences we use today to convey a multitude of concepts, language has evolved to become one of humanity’s most powerful tools. It allows us to connect, create, conspire, control, console, catch up, and so much more. How did we come to have this uniquely human trait? What anatomical changes or cultural developments were necessary for language to evolve? What differentiates language from communication? In this TPWKY book club episode, Professor Steven Mithen joins us to discuss his latest book The Language Puzzle: Piecing Together the Six-Million-Year Story of How Words Evolved. By combining scholarship across wide-ranging fields such as archaeology, genetics, anthropology, linguistics, neuroscience, and more, Professor Mithen presents a compelling story of the origins of language. If you’ve ever wondered how babies can go from babbling one day and talking in a torrent of words the next, or how an individual language changes with each generation, this is the episode and book for you.

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In last week’s episode, we traced the history of fluoridation (and the anti-fluoridation movement) to its roots in the early 20th century, but we left you wondering whether there’s anything to back up the health claims that anti-fluoridationists make. Today, we get deep into the weeds of the fluoride literature, explaining how this mineral works, the difference between topical and systemic fluoride, and whether fluoridation has been linked to any health issues. The details matter, and don’t you worry - we’ve got plenty of nitty gritty for you to feast on.

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Is it just us, or does it seem like every other week there’s a new headline about some state or town banning water fluoridation? As it turns out, this has been going on for decades, basically since fluoride was first introduced. Why are some people opposed to fluoride? Is there any basis to their fears? What does fluoride actually do? And how the heck did we find out about it? This week and next, we’re deep diving into our first dental discussion about this revolutionary mineral. In the first of these episodes, we explore the origins of fluoridation and the outcry against it - how did tuberculosis, a gold rush town, and a dentist with an insatiable curiosity set the stage for one of the greatest public health achievements of the 20th century? And why has there been pushback against it since its inception? Tune in to find out.

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For many of us, pelvic exams are a routine part of our healthcare. Of course, that doesn’t mean we don’t await them with some dread or anxiety; naturally, these exams evoke a wide range of emotions. But they are a cornerstone in gynecological preventative care - a relatively new one at that. In this TPWKY book club episode, we sit down with Dr. Wendy Kline, Historian of Medicine at Purdue University, to discuss her book Exposed: The Hidden History of the Pelvic Exam. Dr. Kline takes readers through various chapters in the story of this exam: its murky origins at the hands of J. Marion Sims, its stint as a psychological diagnostic tool used by some misogynistic doctors, and its reclamation by feminist physicians and activists who sought to connect with their own bodies. Tune in for a fascinating conversation that exposes all sides of the pelvic exam, with heroes, villains, and more.

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If you’ve ever read the little instructions pamphlet included in a box of tampons, you probably came across a paragraph calling attention to a condition called toxic shock syndrome (TSS). It describes the association between TSS and tampon use, symptoms of TSS, and guidance on how to reduce risk. This legally mandated warning label has formed an indelible link connecting tampons and TSS, and indeed, tampons form a large part of the story of TSS. But they are not the entire story. In this episode, we delve into that full story, examining what TSS actually is, the pathogens it’s associated with, and how it was first identified. If you’ve had TSS questions ever since you first heard of it in health class or on your box of tampons, this is the episode for you!

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This week, we’re coming at you with a classic TPWKY episode on one of the most notorious poisons out there: strychnine. Although strychnine might not flash across too many headlines these days, it was once imported by the ton in certain regions of the world. What did people want with so much strychnine? Depends on who you ask. Maybe it was for a revitalizing tonic, maybe a rat poison, or maybe it was to murder the founder of a famous university. Tune in to learn how this deadly poison acts on the body and keep listening for a very special musical treat. 

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For the past few months, measles has been in regular rotation in the news cycle here in the US, with outbreaks occurring across the country in regions with low vaccine uptake. These outbreaks represent a worrying trend in the rejection of scientific and medical expertise, with long-term consequences not only for those individuals refusing vaccines but also the communities to which they belong. In this TPWKY book club episode (recorded March 14, 2025), Dr. Adam Ratner joins us to discuss his book Booster Shots: The Urgent Lessons of Measles and the Uncertain Future of Children's Health. With his firsthand experience treating children with measles and other vaccine-preventable diseases, Dr. Ratner provides a powerful perspective on the dangers of the measles virus and vaccine hesitancy. What can we learn from the history of measles and the measles vaccine rollout? Why is measles such a dangerous virus? Where do we go from here? Tune in for all this and more.

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Last week, we started this two-parter with a big picture view of pasteurization and the raw milk movement. In this episode, we address the alleged health claims made by proponents of raw milk and dive into the very real risks carried by its consumption. Is raw milk actually better for you? Does it have more vitamins or prevent allergies? What deadly pathogens does it harbor? How much does drinking raw milk increase your chance of contracting a milk-related disease? (Spoilers: A LOT). We tackle these questions with reliable data that paint a very different picture of raw milk than that shown by many raw milk influencers. Tune in for all this and more.

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Seriously, what’s the deal? Lately, it seems like raw milk has started to pop up more and more frequently in our feeds, with influencers touting the alleged health benefits of raw milk over pasteurized milk. In this and next week’s episode, we explore the raw milk phenomenon as it has grown over the past few decades. We start this two-parter with a look at the dangers of milk in a pre-pasteurization world, how Pasteur developed the life-saving process that bears his name, the subsequent rise of anti-pasteurizers, and how the anti-science sentiment surrounding raw milk today reveals a larger and more troubling agenda.

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Tuberculosis, or consumption as it was once known, might conjure up images of huge sanitoriums or writers and artists from the late 1800s (Moulin Rouge, anyone?). But this deadly disease is far from an illness of the past. In many parts of the world, tuberculosis remains an insidious killer, despite the fact that we’ve had effective drugs to treat the infection for decades. In this week’s TPWKY book club episode, we’re thrilled to be joined by the one-and-only John Green to chat about his latest book, Everything Is Tuberculosis. Tune in for a fascinating conversation that tours the past, present, and uncertain future of this devastating illness.

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After last week’s episode, we all know about each of the diseases that we’re protected against thanks to our childhood vaccine schedule here in the US. And after this week’s episode, we’ll understand more about the schedule itself - why it might look different from other schedules around the world, how it gets made, and who makes the recommendations. We’ll also review some of the current outbreaks of vaccine-preventable diseases before leaving you with some of our thoughts on how to talk about vaccines and vaccine hesitancy.

Updates:

At the time of recording, the ACIP meeting originally scheduled in Feb 2025 had not been rescheduled. It is now rescheduled for April 15-16 and the agenda is posted here: https://www.cdc.gov/acip/meetings/index.html

Additionally, the case numbers of current measles outbreaks in the US have grown substantially since the time of our recording. Updated case numbers are reported every Friday here: https://www.cdc.gov/measles/data-research/index.html and at the time of episode release there have been 712 cases reported in the US and 3 deaths.

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We’re already back with our first episode of season 8! This week and next, we’re exploring childhood vaccine schedules - what diseases they protect us from, how the schedule is arranged, and who decides on the vaccines to include and the timing of vaccinations. In this first episode, we start with a refresher on how vaccines work before running through the entire schedule we have here in the US, vaccine by vaccine, comparing pre- and post-vaccine mortality rates. We close out the episode by discussing why vaccination is so important, not just for personal protection but for our communities. Stay tuned for more childhood vaccine schedule talk next week!

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Content Warning: This episode includes mentions of miscarriage, pregnancy loss, pregnancy complications, traumatic birth experiences, and other potentially disturbing topics related to childbirth, pregnancy, and the postpartum period.

We close out our pregnancy series with a big picture view of how the childbirth experience has changed over the past century - both for the better and for the worse. From home to hospital, what have we lost and what have we gained? We also delve into the period known as the fourth trimester, examining the physiological changes that can occur after childbirth as well as one of the most common (but not commonly discussed) conditions that people develop during this time: postpartum depression. Tune into this info-packed episode, and don’t forget to send us your recommendations for future topics!

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