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[[18th Century|1787]] – The [[United States of America|United States Constitution]] is signed in Philadelphia. <br>[[19th Century|1822]] – The "Rosetta Stone," a block of triple inscriptions integral in deciphering other languages, is first translated. <br>[[1953]] – The first conjoined twins are successfully separated by surgery. <br>[[1916]] – During [[World War I]], Manfred von Richthofen ("The Red Baron"), a flying ace of the [[Germany|German]] Luftstreitkräfte, wins his first aerial combat. <br>[[1976]] – The first Space Shuttlespace [[shuttle]], [[Enterprise]], is unveiled by [[NASA]].<br>