In 1943 Swiss chemist Albert Hofman discovered he'd created what may be the most potent hallucinogen known to humankind. Then he took a bike ride. Learn about the chemistry, neurology, history and cultural impact of LSD-25 in this classic episode.

The Disappearance of Dorothy Arnold
42:14

Short Stuff: Currency Symbols
13:04

Asteroooooid De-FENSE!
41:33