Science

Underwater explorer and photographer Jill Heinerth has dived into unmapped caves deep in the earth, and beneath a giant iceberg. She's seen hidden creatures old as dinosaurs, and witnessed scenes of surreal beauty. Her work is so dangerous, over a hundred of her friends and colleagues have died in caves. She talks about the risks and rewards of her work.

We tend to think of being asleep or awake as an either-or prospect: If you're not asleep, then you must be awake. But sleep disorder specialist and neurologist Guy Leschziner says it's not that simple.

We listen to archival interviews with Michael Collins, of Apollo 11; Alan Shepard, the first American in space; Canadian astronaut Chris Hadfield; and Chuck Yeager, who first broke the sound barrier.

In 1961, when President John F. Kennedy announced a goal of "landing a man on the moon and returning him safely to the earth" before the end of the decade, the mission seemed all but impossible.

Author Michael Pollan experimented with mushrooms, LSD and other psychedelics while researching his latest book, How to Change Your Mind. Originally broadcast May 15, 2018.

A talk with Nathaniel Rich, author of the new book 'Losing Earth' about climate change and the missed opportunities to halt or at least slow it down, and where we are now in the Trump era.

Dr. Thomas Boyce, an emeritus professor of pediatrics and psychiatry at the University of California, San Francisco, has treated children who seem to be completely unflappable and unfazed by their surroundings — as well as those who are extremely sensitive to their environments. Over the years, he began to liken these two types of children to two very different flowers: dandelions and orchids.