http://www.age-of-the-sage.org/greek/philosopher/pythagoras_biography.html

History of Pythagorean Society  http://history.hanover.edu/texts/presoc/pythagor.htm

Biography written for upper elementary included in AIMS preview of Historical Connections in Mathematics: http://wwws.aimsedu.org/previews/bkprev/HistConn1.html

"Number rules the universe."

"There is geometry in the humming of the strings."

Activities and problem solving from Historical Connections in Mathematics (click on the preview from AIMS site)

Pythagorean Theorum Proof  http://mathforum.org/isaac/problems/pythagthm.html

More Pythagorean proofs   http://www.cut-the-knot.org/pythagoras/index.shtml

Interactive Theorum Proof   This site has a very good step by step demonstration of a proof of the Pythagorean Theorem, a2 + b2 = c2

A Collection of Essays and Lessons for Jr /Sr High School  http://www.mathgym.com.au/history/pythagoras/pyth.htm

Pythagoras' Mystery Tablet  http://mathforum.org/escotpow/solutions/solution.ehtml?puzzle=46http://www.shodor.org/interactivate/activities/pyth2/index.html

Music in Space  http://www.aboutscotland.com/harmony/prop.html

The Magic of Pythagoras in an Unknown Rectangle  http://168.144.111.81/shape_space/magicofpythagoras.htm

First known ancient to study and develop mathematics as an abstract art. Considered the originator of number theory.

Pythagoras and Early Greek Mathematics

Born: about 560 BC  Died: about 480 BC, Ionia Greece