1917 Battle of Passchendaele: Canadian troops capture the village of Passchendaele in the Third Battle of Ypres, after 250,000 casualties on both sides 1939 Adolf Hitler announces plans to regulate Jewish problem 1948 The 1948 Ashgabat earthquake kills 100,000 in the Turkmen Soviet Socialist Republic 1948 Paleoanthropologist Mary Leakey finds the first partial fossil skull of Proconsul africanus, an ancestor of apes and humans on Rusinga Island, Kenya 1951 Joseph Stalin proclaims the Soviet Union has the atomic bomb 1956 Scientist Albert Sabin announces that his oral /www.onthisday.com/photos/polio">polio">polio vaccine is ready for testing; it would soon supplant Jonas Salk's vaccine in many parts of the world | 
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