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cut-away view of Earth's interior Mathematics.
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Life by the Numbers

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ArchimedesArchimedes worked out the ratio of the length of a circle's circumference to its radius (pi), discovered the principle of buoyancy, explored the principle of the lever, and devised numerous machines to help defend his home town from invading Roman armies.
Difference EngineThe Difference Engine was conceived to calculate and automatically print error-free mathematical tables. It is so named because of the mathematical principle upon which it is based, the method of finite differences.
 
Rubik's CubeRubik's Cube was invented by a Hungarian professor in 1974, as a mental exercise for his students. The cubic puzzle quickly became a craze in Hungary, then spread across Europe, and by 1980 was the top-selling toy in the United States.
 
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This page was last updated on 02/02/2010.