Distillations | Science History Institute

When you bite into a taco, quesadilla, or anything else involving a traditionally made corn tortilla, your taste buds get to experience the results of an ancient chemical process called nixtamalization. The technique dates to around 1500 BCE and involves cooking corn kernels with an alkaline substance, like lime or wood ash, which makes the dough softer, tastier, and much more nutritious. Only in the 20th century did scientists figure out the secret of nixtamalization—the process releases niacin, one of the essential B vitamins. Our guest, archaeologist and nixtamalization expert Rachel Briggs, says that the historical chemical process transformed corn from a regular food into a viable dietary staple, one that cultures around the world continue to rely on for many of their calories. Without nixtamalization Mesoamerican civilizations like the Maya and the Aztec would not have survived, let alone flourished. Benjamin Miller and Christina Martinez are the only chefs in Philadelphia making their tortillas from scratch. Our associate producer, Rigoberto Hernandez, visited the couple at their traditional Mexican restaurant in South Philadelphia to find out why they’re so dedicated to handmade tortillas—and to see the nixtamalization process in action.   Credits: Hosts: Michal Meyer and Bob Kenworthy Guest: Rachel Briggs Reporter: Rigoberto HernandezProducer: Mariel Carr Associate Producer: Rigoberto Hernandez Music courtesy of the Audio Network

Everyone knows blood is powerful. The ancient Greeks realized it, Jesus understood it, Dracula certainly recognized it, and your doctor still knows it today. And everybody knows, says hematologist and historian of medicine Jacalyn Duffin, that if we lose a lot of blood, we’re going to die. Jehovah’s Witnesses’ beliefs have led them to refuse blood transfusions—to the consternation of many inside the medical profession. But the religious group still wants medical care, says reporter Alex Ashley, and their advocacy has helped propel a new movement in medicine in which doctors perform surgeries without transfusing blood. Remarkably, it has turned out better for everyone, suggesting that religion and medicine might be less at odds than they sometimes seem. Show Clock: 00:04 Intro01:35 Feature: When a Pint of Sweat Saves a Gallon of Blood14:04 Blood is powerful17:25 Blood is religious18:40 Blood is a miracle21:45 Blood is dangerous24:35 Conclusion Credits: Hosts: Michal Meyer and Bob KenworthyGuest: Jacalyn DuffinReporter: Alex AshleyProducer: Mariel CarrAssociate Producer: Rigoberto Hernandez Music: Music courtesy of the Audio Network. "Power in the Blood" courtesy of Shiloh Worship Music.  

Scientists experimented with skin and organ transplants for a long time before they finally met with success in the mid-20th century. Now surgeons are expert at performing transplants. The only problem? There aren’t enough organs to go around, which creates some serious ethical dilemmas. First, reporter Dalia Mortada takes us to Tel Aviv, Israel, where a dialysis patient waiting for a new kidney is running out of patience. Conflicting religious interpretations have prevented many Israelis from signing up to become organ donors. This has created a serious supply-and-demand problem, leading many desperate patients to the black market. Mortada tells us how this trend is slowly changing and talks to the doctors, rabbis, and bioethicists behind the shift. Then we talk to American bioethicists Art Caplan and Robert Baker about the pitfalls of the U.S. donation system. “You sign up when you go to Motor Vehicles,” Caplan says, “which may not be the ultimately wonderful place to make [these] decisions, other than the fact that you may wait there long enough to die there, in which case they can probably get your organs.” Show Clock: 00:04 Introduction01:13 Waiting for a kidney in Tel Aviv10:25 Why do we need Bioethics? Credits: Hosts: Michal Meyer and Bob KenworthyGuests: Art Caplan and Robert BakerReporter: Dalia MortadaProducer: Mariel CarrAssociate Producer: Rigoberto Hernandez Music: Music courtesy of the Audio Network. 

Americans have had a long, complicated relationship with the pesticide DDT, or dichloro-diphenyl-trichloroethane, if you want to get fancy. First we loved it, then we hated it, then we realized it might not be as bad as we thought. But we’ll never restore it to its former glory. And couldn’t you say the same about America’s once-favorite pop star? We had a hunch that the usual narrative about DDT’s rise and fall left a few things out, so we talked to historian and CHF fellow Elena Conis. She has been discovering little-known pieces of this story one dusty letter at a time. But first our associate producer Rigoberto Hernandez checks out some of CHF’s own DDT cans—that’s right, we have a DDT collection—and talks to the retired exterminator who donated them.  Show Clock: 00:03 Introduction01:26 DDT's Rise06:56 DDT's Fall13:24 DDT's Complicated Legacy  Credits: Hosts: Michal Meyer and Bob KenworthyGuest: Elena ConisProducer: Mariel CarrAssociate Producer: Rigoberto Hernandez Music: Music courtesy of the Audio Network. 

2015 was a good year for outer space. Star Wars: Episode VII came out, NASA started hiring astronauts again, SpaceX successfully launched and returned a rocket, and the U.S. Congress passed the SPACE Act of 2015—a bill that gives any American who extracts resources from an asteroid legal rights to the bounty they reap. Since no one has yet mined an asteroid this legislation might seem premature, but it’s essential to the future of two Silicon Valley asteroid mining companies. That’s right, they already exist. They’re just waiting for humans to start colonizing space. Reporters Katie Gilbert and Annie Costakis talk to Daniel Faber, the founder of Deep Space Industries, about his dream: to build the space equivalent of Home Depot, as well as fueling stations and manufacturing plants. They also explain a few of the untested theories behind asteroid mining. We wanted to know more about the history of space dreaming and space colonies, so we talked to Patrick McCray, a historian of science and technology and the author of The Visioneers: How a Group of Elite Scientists Pursued Space Colonies, Nanotechnologies, and a Limitless Future. He says utopian space visions have long filled the heads of scientifically minded dreamers, especially when life on Earth isn’t going so well.   Show Clock: 00:03 Introduction01:26 Will asteroid mining save us?12:40 Who were the visioneers? Credits: Hosts: Michal Meyer and Bob KenworthyGuest: Patrick McCrayReporters: Katie Gilbert and Annie CostakisProducer: Mariel CarrAssociate Producer: Rigoberto Hernandez Music: "Boop" By Podington Bear, courtesy of the Free Music Archive. Additional music courtesy of the Audio Network.   

Several years ago historian of medicine Alice Dreger found herself in a room full of intersexed people, individuals with reproductive or sexual anatomy that is neither typically female nor male. Dreger noticed something strange: many of them had teeth that were in bad shape. She soon learned that many of them had endured such traumatic experiences with doctors that they wouldn’t go near anyone in a white coat, including dentists. We were astonished by this story, so we asked Dreger to tell us more. She joined us for our December podcast alongside Eric Vilain, a medical geneticist and director of the Center for Gender-based Biology at UCLA. While intersex, transgender, and transsexual issues have recently entered the mainstream, our guests explain that there have always been those whose anatomy or identity prevents them from fitting neatly into the categories of male or female. And even with this newfound exposure, tensions continue to exist for them all. But first we’ll hear about the experiences of a transgender couple desperate to conceive a child, but who struggled to find a willing doctor. Mariel Carr visits them at home in Philadelphia, where they’re adapting to life with an infant. Show Clock: 00:03 Introduction 01:26 Feature story: "The Pregnant Man"  14:48 Interview with Alice Dreger and Eric Vilain Credits: Hosts: Michal Meyer and Bob Kenworthy Guests: Alice Dreger and Eric Vilain Reporter: Mariel Carr Producer: Mariel CarrAssociate Producer: Rigoberto Hernandez Music: Music courtesy of the Audio Network. 

Hackers. Spies. Secrets. This is the menacing language of industrial espionage. But how easy is it to plunder a company for its ideas? Not very, says our guest, Douglas O’Reagan, a historian of science and technology. Throughout history, O’Reagan argues, stealing trade secrets has proven more complicated than lifting a blueprint or section of computer code. What makes a company successful is usually much harder to grasp. But first we look at how one company is trying to pass on the skills and secrets responsible for its success. Reporter Susanne Gietl visits the small Bavarian town of Ingolstadt, headquarters of German automaker Audi. There she finds hundreds of Mexican workers learning skills, secrets, and the “German way” to build cars so they can bring that knowledge back to Mexico. Join us for a trip to the murky world of technology transfer. Show Clock: 00:04 Introduction01:40 Feature story: Learning the "German way" 10:20 Interview with Douglas O'Reagan Credits: Hosts: Michal Meyer and Bob KenworthyGuests: Douglas O'ReaganReporter: Susanne GietlProducer: Mariel CarrAssociate Producer: Rigoberto Hernandez Music: Music courtesy of the Audio Network.  "Odyssey" by Kevin MacLeod Licensed under Creative Commons: By Attribution 3.0

Celebrities, politicians, and scientists have fiercely debated the safety of using genetically modified organisms, or GMOs, in food. It remains to be seen whether GMO labeling becomes mandatory in the United States, but there’s no doubt that the “GMO-free” sticker is garnering the prestige and premium prices already reaped by the labels “organic” and “gluten-free.” But what’s the big fuss? And how did this great GMO debate begin?To find out Distillations goes to the soy and corn fields of Iowa where reporter Amy Mayer hears the perspectives of a few Midwesterners, including two farmers who have found a lucrative niche for the GMO-free crops they’re growing. Then, we’ll talk with plant geneticist Pamela C. Ronald and organic farmer Raoul Adamchak. Together they wrote Tomorrow’s Table: Organic Farming, Genetics, and the Future of Food. And they’re married—to each other.

Ten years ago Hurricanes Katrina and Rita tore into the Gulf Coast and displaced more than one million residents. For many of these people, trailers provided by the Federal Emergency Management Agency became their homes. But many of the new occupants soon found it hard to breathe, suffering flulike symptoms, stinging eyes, and nosebleeds. The culprit was formaldehyde, which emanated from the hastily assembled, substandard materials used to make the trailers. A decade after the storms Distillations follows CHF researcher and medical anthropologist Nick Shapiro as he searches for the remaining FEMA trailers. His search takes him to the oil fields of North Dakota, where a different kind of housing crisis is taking place.    

Most of us are familiar with the achievements of Galileo and Newton, but who were their peers? And what was it like to practice science in the 16th and 17th centuries? Come geek out with us as we travel back in time and explore what the world was like when science and the supernatural were not so far apart. We talk to two historians of science, Deborah Harkness and James Voelkel. Harkness is the author of The Jewel House: Elizabethan London and the Scientific Revolution as well asthe All Soul’s Trilogy, a popular fantasy series filled with witches, vampires, demons, scientists, and historians. Voelkel is the curator of rare books at CHF and an expert on Johannes Kepler, a 17th-century astronomer, mathematician, and astrologer.   Though we were unable to time travel for this show (much to our dismay), we did get to visit the Making and Knowing Project’s laboratory at Columbia University, where a group of historians of science are reconstructing a 16th-century workshop and re-creating recipes from an anonymous craftsperson’s manuscript. And we made this video. SHOW CLOCK: 00:05 Introduction 01:10 Interview with Deborah Harkness and James Voelkel CREDITS: Hosts: Michal Meyer and Bob Kenworthy Guests: Deborah Harkness and James Voelkel Producer & Editor: Mariel Carr Music courtesy of the Audio Network.