– World War II: Soviet and Bulgarian forces capture Vienna. 1948 – In an ambush, 78 Jewish doctors, nurses and medical students from Hadassah Hospital, and a British soldier, are massacred by Arabs in Sheikh Jarrah. This event came to be known as the Hadassah medical convoy massacre. 1953 – CIA director Allen Dulles launches the mind-control program Project MKUltra. 1958 – American pianist Van Cliburn is awarded first prize at the inaugural International Tchaikovsky Competition in Moscow. 1960 – The United States launches Transit 1-B, the world's first satellite navigation system. 1964 – At the Academy Awards, Sidney Poitier becomes the first African-American male to win the Best Actor award for the 1963 film Lilies of the Field. 1970 – An oxygen tank aboard the Apollo 13 Service Module explodes, putting the crew in great danger and causing major damage to the Apollo command and service module (codenamed "Odyssey") while en route to the Moon. 1972 – The Universal Postal Union decides to recognize the People's Republic of China as the only legitimate Chinese representative, effectively expelling the Republic of China administering Taiwan. 1972 – Vietnam War: The Battle of An Lộc begins. 1975 – An attack by the Phalangist resistance kills 26 militia members of the Popular Front for the Liberation of Palestine, marking the start of the 15-year Lebanese Civil War. 1976 – The United States Treasury Department reintroduces the two-dollar bill as a Federal Reserve Note on Thomas Jefferson's 233rd birthday as part of the United States Bicentennial celebration. 1976 – Forty workers die in an explosion at the Lapua ammunition factory, the deadliest accidental disaster in modern history in Finland. 1996 – Two women and four children are killed after Israeli helicopter fired rockets at an ambulance in Mansouri, Lebanon. 1997 – Tiger Woods becomes the youngest golfer to win the Masters Tournament. 2017 – The US drops the largest ever non-nuclear weapon on Nangarhar Province, Afghanistan. Births Pre-1600 1229 – Louis II, Duke of Bavaria (d. 1294) 1350 – Margaret III, Countess of Flanders (d. 1405) 1506 – Peter Faber, French priest and theologian, co-founded the Society of Jesus (d. 1546) 1519 – Catherine de' Medici, Italian-French wife of Henry II of France (d. 1589) 1570 – Guy Fawkes, English soldier, member of the Gunpowder Plot (probable; d. 1606) 1573 – Christina of Holstein-Gottorp (d. 1625) 1593 – Thomas Wentworth, 1st Earl of Strafford,