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 London Fog That Killed 12,000
10:19

The Backstory: Sibling Squabbles in Royal Families
09:59

The Backstory: Famous Cat Lovers
06:59