Galileo Galilei discovered Callisto, the fourth moon of Jupiter.
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Alfredo Ormando set himself on fire in St. Peter's Square, protesting against the Roman Catholic Church's teaching on homosexuality.
Johnny Cash recorded his iconic live album, At Folsom Prison.
Walt Disney's Mickey Mouse comic strip was published for the first time.
Avezzano earthquake claimed 30,000 lives in Italy.
Nine thousand scientists from 43 nations signed a petition to ban nuclear testing.
