|via the guardian|
They also developed astronomy to a mind blowing level, considering they didn't have Google. Ponticus was the first to propose that Earth rotated about on an axis and Eratosthenes actually estimated the Earth's circumference quite accurately using the angles of SHADOWS. Don't ask me how this works, because I have no idea.
Other things the Great Greeks gave us: plumbing, medicine and vending machines. These people were tops.