1752 Britain and the British Empire (including the American colonies) adopt the Gregorian Calendar (no Sept 3 - Sept 13)
1939 World’s 1st practical helicopter, the VS-300 designed by Igor Sikorskytakes (tethered) flight in Stratford, Connecticut
1949 India's Constituent Assembly adopts Hindi as an official language. Celebrated today as Hindi Day.
1956 1st prefrontal lobotomy performed in Washington, D.C.
1960 Iraq, Iran, Kuwait, Saudi-Arabia and Venezuela form the Organization of Petroleum Exporting Countries (OPEC)
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