Is that really true about Feynman? I thought he wrote in "Surely You're Joking" that he didn't take psychoactive drugs because he loved thinking and he "didn't want to mess up the machine".
From: https://gizmodo.com/10-scientific-and-technological-visionar...
> Nevertheless, Feynman's curiosity got the best of him when he became acquainted with none other than John C. Lilly and his sensory deprivation tanks. Feynman experimented briefly with LSD, ketamine, and marijuana, which he used to bring on isolation-induced hallucinations more quickly than he could when sober.
As an aside, that page has a list of other notable scientists who also experimented with psychoactive drugs.