Computer Animations using Maple
Watch Out for that Last Step, by Alex I.

Triangle Fun
	Proof of Pythagorean Theorem

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Logic Puzzles:

I'm Lying

Map Coloring

Cryptography:

Dszquphsbqiz

Platonic Solids and Euler Numbers
	Stellated Icosahedron

    Counting, Probability and Infinity

Math Games, Puzzles and Contests