Galileo spots some of Jupiter's moons, the Harlem Globetrotters play their first game, Truman announces the development of the H-bomb, and President Clinton's impeachment trial begins, all on this day.
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Johann H. Addicks/Wikimedia Commons
1990: The interior of the Leaning Tower of Pisa is closed to the public because of safety concerns. After a decade of corrective reconstruction and stabilization efforts, the tower would be reopened to the public on Dec. 15, 2001, and be declared stable for at least another 300 years.