The Greatest Invention of Man ever created...

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We're now living in the 21st century... where the technology of today is totally different from the past... Man are able to travel in air & space w/ speed & accuracy. So many personal gadgets have revolutionized the past 5 years making each lives very convenient...Telecommunication throughout the world is at it's best made possible by fiber optic technology... But all of this have rooted from a single but very important creation of man... What do you think is the greatest invention of man that started this technology revolution? My own opinion... it's dated back Before Christ (B.C) when the great system of government that Roman & Greek had implemented during the barbaric era of man... They have set the standard of a United Community, from this community... Great Men of History like Plato, Aristotle, Homer, Julius Ceasar were born & started the 'Thinking Man Age' & their inspirations was carried over during the renaissance period where another sets of Great Men inspired the Men of the 20th century...