Terry Gross

German filmmaker Werner Herzog was one of the few people permitted to enter a cave in France containing the oldest recorded cave paintings. What he saw — and what he imagined — is the subject of a new documentary, The Cave of Forgotten Dreams.

Jon Sarkin was working as a chiropractor when he suffered a massive stroke. Afterwards, he became an obsessive visual artist whose work was as fragmented and cluttered as his mind had become. Sarkin is the subject of a new book, Shadows Bright as Glass, by science writer Amy Nutt.

New York Times investigative journalist Walt Bogdanich discusses his ongoing series on mistakes made during radiation treatments. He also details what a patient should always ask before receiving an type of X-ray, scan or radiation treatment.