In the newest show from the Freakonomics Radio Network, host Zachary Crockett explores the hidden side of the things around us. This week: How do dinosaur bones emerge from the Upper Cretaceous period to end up in natural-history museums and private collections?

Robert Solow is 98 years old and a giant among economists. He tells Steve about cracking German codes in World War II, why it’s so hard to reduce inequality, and how his field lost its way.

Talithia Williams thinks you should rigorously track your body's data. She and Steve Levitt trade birth stories and bemoan the state of STEM education.

Kevin Kelly believes A.I. will create more problems for humanity — and help us solve them. He talks to Steve about embracing complexity, staying enthusiastic, and taking the 10,000-year view.

Clementine Jacoby went from performing in a circus to founding a nonprofit that works to shrink the prison population.

Steve is on a mission to reform math education, and Sarah Hart is ready to join the cause. In her return visit to the show, Sarah explains how patterns are everywhere, constraints make us more creative, and literature is surprisingly mathematical.

From recording some of the first rap hits to revitalizing Johnny Cash's career, the legendary producer has had an extraordinary creative life. In this episode he talks about his new book and his art-making process — and helps Steve get in touch with his own artistic side.

Physician Peter Attia returns to the show to talk about the science of longevity — which focuses not only on extending life but on maintaining good health into old age. He explains the possibilities and limits of current medicine and gives Steve his best advice on how to defeat the aging process.

Steve and producer Morgan Levey look back at the first 100 episodes of the podcast, including surprising answers, spectacular explanations, and listeners who heard the show and changed their lives.

Tom Dart is transforming Cook County’s jail, reforming evictions, and, with Steve Levitt, trying a new approach to electronic monitoring.

Since his last visit to "People I (Mostly) Admire," the formerly top-ranked golfer has become the sport's most controversial figure. Why has he partnered with the Saudi government — and can his new golf league unseat a monopoly?

Neil Shubin hunts for fossils in the Arctic and experiments with D.N.A. in the lab, hoping to find out how fish evolved to walk on land. He explains why unlocking these answers could help humans today.

Ecologist Suzanne Simard studies the relationships between trees in a forest: they talk to each other, punish each other, and depend on each other. What can we learn from them?

The mathematician and author sees mathematical patterns everywhere — from DNA to fireflies to social connections.

When "Freakonomics" co-authors Steve Levitt and Stephen Dubner first met, one of them hated the other. Two decades later, Levitt grills Dubner about asking questions, growing the pie, and what he learned from Bruce Springsteen.

From baseball card conventions to Walmart, John List has always used field experiments to say revolutionary things about economics. He explains the value of an apology, why scaling shouldn’t be an afterthought, and why he moved to the private sector to stay at the forefront of science.

Former professional poker player Annie Duke has a new book on Steve’s favorite subject: quitting. They talk about why quitting is so hard, how to do it sooner, and why we feel shame when we do something that’s good for us.

Author and YouTuber John Green thought his breakout bestseller wouldn’t be a commercial success, wrote 40,000 words for one sentence, and brought Steve to tears.

The ethologist and conservationist discusses the thrill of observing chimpanzees in the wild, the value of challenging orthodoxy, and why dying is her next great adventure.

The philosopher known for his rigorous ethics explains why Steve is leading a morally inconsistent life.

Stanford professor Carolyn Bertozzi’s imaginative ideas for treating disease have led to ten start-ups. She talks with Steve about the next generation of immune therapy she’s created, and why she might rather be a musician.

Heeding the warnings of public health officer Charity Dean about Covid-19 could have saved lives. Charity explains why she loves infectious diseases and why she moved to the private sector.

The documentary filmmaker, known for "The Civil War," "Jazz," and "Baseball," turns his attention to the Holocaust, and asks what we can learn from the evils of the past.

Harvard economist Raj Chetty uses tax data to study inequality, kid success, and social mobility. He explains why you should be careful when choosing your grade school teachers — and your friends.

Philosopher Will MacAskill thinks about how to do as much good as possible. But that's really hard, especially when you're worried about humans who won't be born for many generations.