THALESMiletus, approx. 640 - 546 B.C.
One of the seven Sages of the ancient Greek world. After getting rich by the salt trade, he visited Egypt bringing back home the use of what was called the "Egyptian Fractures". He calculated the height of the great Pyramids using their shadows on the ground, and found the reason of the yearly Nile floods. He discovered the attraction of several light objects to electrum ( the first observation of static electricity, where it owes its name too). Thales foretold the Sun Eclipse of the 28th of May 585 BC, and he is considered as the founder of Theoretical Geometry. He believed that water was the origin of everything.