1610 Galileo Galilei discovers the first three moons of Jupiter: Io, Europa & Ganymede 1714 Typewriter patented by Englishman Henry Mill (built years later) 1941 Chinese Kuomintang forces under orders from Chiang Kai-shek open fire on the surrounded Communist New Fourth Army at Maolin, Anhui Province, killing or capturing 7,000 troops 1953 US President Harry Truman announces American development of the hydrogen bomb 1954 Georgetown-IBM experiment, 1st public demonstration of a machine translation system, is held at IBM's head office in New York 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 | 
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