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Physics Links

Physics Demonstration Sites

Demos at Physics Lessons dot com

Lecture Demos Search Engine

Optical Illusions

Optical Illusions and Visual Phenomenon

Sandlot Science Optical Illusions

Cool Optical Illusions

Perceptual Science Group @ MIT

Optics for Kids: Optical Illusions

The Eyeballing Game

Catapult Research Resources

The Sinews of War

3D Simulator of Catapult

(requires Shockwave)

How Stuff Works: Catapults

Ancient Greek Artillery

Medieval Castles-Siege-Weapons.com

Catapults.info

Notes section of Wikipedia's entry

Check the Notes section of Wikipedia's entry for several book references.

Physics of the Trebuchet

Trebuchet.com

Nova's companion site

to their Medieval Siege Episode

Video of Onager re-enactment

How to build Catapults

(more for building ideas than for historical research)

http://www.nzp.com/

Unfortunately the Catapult Museum seems to be down. It was originally available at the URL above.

Remember, anyone can write a website about catapults - that doesn't mean they actually know anything about them. So use more than one source (4 are required) and if you can suppliment online references with book references, even better.