Mathematical
Miscellanea
  A short proof of the Pythagorean Theorem, by Poo-sung Park.
  An animated proof of the Pythagorean Theorem, by Erich Neuwirth.
  A right triangle generator, by Heiner Becker.
  Greg Egan's Syntheme - best icosahedron on the web.
  The remarkable number 1/89, by Robert Miner.
  Some thoughts on the number 6, by John Baez.