Wired - this day in tech: April 16, 1943: Setting the Stage for World’s First Acid Trip

I've always loved the story of how LSD was discovered. It's like a good piece of fiction:
Hofmann, a Swiss chemist, was researching the synthesis of a lysergic acid compound, LSD-25, when he inadvertently absorbed a bit through his fingertips...
From WIRED
Image: Wikipedia
Hofmann's account of the events makes for an entertaining read.