Scientists believe that 99% of the estimated 50 billion species that have ever lived on Earth have disappeared through extinction. This is a natural process typically, but it can also be cataclysmic and it's becoming clear we are amid a massive one. Find out more with Josh and Chuck in this classic episode.

Three Mile Island
45:41

Short Stuff: 1955 Le Mans Disaster
12:32

The Tragic Life of Vincent Van Gogh
51:48