How the Greek Agora Changed the WorldBy Heather Whipps, LiveScience's History Columnist posted: 17 March 2008 08:15 am ET It was the heart of the city – where ordinary citizens bought and sold goods, politics were discussed and ideas were passed among great minds like Aristotle and Plato. Who knows where we'd be without the "agoras" of ancient Greece. Lacking the concept of democracy, perhaps, or the formula for the length of the sides of a triangle (young math students, rejoice!). Modern doctors might not have anything to mutter as an oath. What went on at the agora went beyond...