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Events on Friday 16 April 1943 1
1943Albert Hofmann discovers the effects of LSDThe first deliberate LSD trip takes place on Bicycle DayChemist Albert Hofmann at Sandoz in Basel absorbed a small amount of LSD by accident on 16 April and noticed unusual effects. On 19 April he deliberately took 250 micrograms and rode home by bicycle as the drug took hold. The date is now remembered as Bicycle Day.