Science Struck
Science Struck: 5 Inventions of Archimedes
Describes five inventions of Archimedes and the stories behind them.
Museum of Science
Science Learning Network: Inventor's Workshop
A short piece on Leonardo da Vinci from the Science Learning Network. Placed here because a) there's a decent drawing of an Archimedes' screw, and b) there's a link to an adequate definition thereof.