Galileo Galilei discovered Callisto, the fourth moon of Jupiter.
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Nine thousand scientists from 43 nations signed a petition to ban nuclear testing.
Instruments used to observe Venus found two-thirds of the planet's southern hemisphere brightened after aerosols were triggered on an 'astronomical' scale.
Serial killer Jeffrey Dahmer changed his plea from not guilty to guilty but insane.
Alfredo Ormando set himself on fire in St. Peter's Square, protesting against the Roman Catholic Church's teaching on homosexuality.
The most destructive riot in Constantinople's history, the Nika Riots, began during a chariot race.
