Dave Davies

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.

Journalist Michael Isikoff hosts a new podcast exploring the motivation and methods of those who promoted wild conspiracy theories about Rich, who was killed in a suspected failed robbery in 2016.

Washington Post tech columnist Geoffrey Fowler listened to four years' worth of audio that Amazon had captured and stored from his Alexa smart speaker. He was surprised by what he found.