1610: Galileo Galilei discovers the first three moons of Jupiter: Io, Europa and Ganymede

1714: Typewriter patented by Englishman Henry Mill (built years later)

1941: New Fourth Army Incident: Chinese Kuomintang forces under orders from Chiang Kai-shek fire on the surrounded Communist New Fourth Army at Maolin, Anhui Province, killing or capturing about 7,000 troops

1953: US President Harry Truman announces the United States’ development of the hydrogen bomb

1954: Georgetown-IBM experiment, the first public demonstration of a machine translation system, is held at IBM headquarters in New York City

1999: President Bill Clinton’s impeachment trial begins in the US Senate after the House voted to impeach him for lying about his affair with Monica Lewinsky

Source: Onthisday.com