Context: According to Genius, the James Gleick-authored biography, Feynman tried LSD during his professorship at Caltech. Somewhat embarrassed by his actions, he largely sidestepped the issue when dictating his anecdotes; he mentions it in passing in the "O Americano, Outra Vez" section, while the "Altered States" chapter in Surely You're Joking, Mr. Feynman! describes only marijuana and ketamine experiences at John Lilly's famed sensory deprivation tanks, as a way of studying consciousness. Feynman gave up alcohol when he began to show vague, early signs of alcoholism, as he did not want to do anything that could damage his brain—the same reason given in "O Americano, Outra Vez" for his reluctance to experiment with LSD.

Question: Which illicit drug did Feynman try at Caltech?
Answer: LSD

Question: What substance did Feynman give up later in life?
Answer: alcohol

Question: Why did Feynman give up alcohol?
Answer: he did not want to do anything that could damage his brain

Question: In what book did he talk about his LSD use?
Answer: O Americano, Outra Vez

Question: Which illicit drug was Feynman caught with at Caltech?
Answer: Unanswerable

Question: What substance did Feynman die from later in life?
Answer: Unanswerable

Question: Why did Feynman enjoy alcohol?
Answer: Unanswerable

Question: What book did Feynman talk about his DMT use?
Answer: Unanswerable

Question: When did Feynman try heroin?
Answer: Unanswerable