1752 Britain and the British Empire (including the American colonies) adopt the Gregorian calendar (no Sept 3 - Sept 13) 1936 1st prefrontal lobotomy in America performed by Walter Freeman and James W. Watts at George Washington University Hospital in Washington D.C. 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 IBM introduces the RAMAC 305, 1st commercial computer with a hard drive that uses magnetic disk storage, weighs over a ton 1960 Iraq, Iran, Kuwait, Saudi-Arabia and Venezuela form the Organization of Petroleum Exporting Countries (OPEC) | 
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