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.

Short Stuff: Did Tippi Hedron start the Vietnamese manicure industry?
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Humanists, the Happy Heathens
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Selects: Can movies be cursed?
52:08