We aren’t exactly sure who invented trick-or-treating – kids who realized they could extort adults for candy, or adults who bought off kids in exchange for laying off pranks? The bigger question is: Will trick-or-treating survive the 21st century? Learn more in this classic episode.

Short Stuff: Aztec Death Whistle
11:30

How Cognitive Biases Work
56:19

Selects: Why Do Great Flood Myths Seem To Be Universal?
44:03