In this replay episode: What would we do to live better, longer, or maybe even forever? Lots of quests for immortality involved mystical potions or objects. And one very popular fad in the 1920s involved transplanted monkey testicles!

The Backstory: The Horrifying Afterlife of Lincoln's Guests at Ford's Theater
10:11

The Backstory: The Secret NASA Test That Almost Ended the Space Race
08:04

The Backstory: Space Junk Falling From the Sky
08:43