1781 British forces under General Charles Cornwallis sign terms of surrender to George Washington and Comte de Rochambeau at Yorktown at 2 pm, ending the US Revolutionary War 1926 Russian Politburo throws out Leon Trotsky and his followers 1943 Streptomycin, the first antibiotic remedy for tuberculosis, is isolated by researchers at Rutgers University in Pistcaway, New Jersey 1987 Black Monday: Stock markets around the world crash, including the Dow Jones stock index, which falls 508.32 points (22%), 4½ times the previous daily record 2015 US scientists from University of California find evidence life on earth may have begun 4.1 billion years ago, 300 million earlier than previously thought | 
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