How Stuff Works
Explains how things work

Simeon's World of Magic
The World's Finest Internet Magician

Cool Math
A collection of math puzzles and quizzes, as well as fractals

Ask Dr. Math
A place to ask questions about math

Sand Lot Science
Collection of illusions

World of Escher
A collection of Escher Art

Illusion Works
A collection of illusions

History of Mathematics
A History of Math

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Illusions
 

Impossible Triangle

Impossible Triangle Exposed

The Devil's Fork