Pythagoras describe relationship between three sides of a right triangle
Tried to understand what elements make up all things
Proposed 4 elements – earth, water, air, and fire- as building blocks of all matter
Democritus theory that unchanging atoms – protons, neutrons, and electrons- make up all things
The U.S. Post Office has decided to issue a set of three stamps commemorating the achievements of the ancient Greeks. You are to submit designs showing what achievements the stamps should highlight and how the stamps should look. All submissions must (1) highlight a different Greek achievement, (2) represent the achievement with a simple visual, and (3) be accompanied by one of two sentences describing the achievement illustrated on the stamp.