John's Links

A sequence of moves by a knight on a chessboard such that the knight visits every square exactly once.

Back-of-a-napkin probabilistic calculator.

Free Moby music to empower your creative projects.

Made using a pipe, a balloon, a string, a little mirror, and a laser.

Dude actually set up his blog to run from a Nintendo Wii.

Just a bit of beauty for your workday.

Full, free math courses for every grade.

It keeps getting better and better.