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[[18th 19th Century|17871822]] – The "[[United States of Americawikipedia:Rosetta Stone|United States ConstitutionRosetta Stone]] 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>[[191619th Century|1857]] – During Pioneer space theorist [[World War Iwikipedia:Konstantin Tsiolkovsky|Konstantin Eduardovich Tsiolkovsky]]is born. While working as a schoolteacher, Manfred von Richthofen ("The Red Baron"), a flying ace Tsiolkovsky worked out many of the principles of space travel. He was recognized by the Soviet Union as the [[Germany|German]] Luftstreitkräfte, wins his first aerial combat“Father of Cosmonautics. ” <br>