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What is a cylinder? Simple geometry

By |2017-07-29T09:33:37+00:00July 29th, 2017|Math|

This is a cylinder. What can you find around your house that's a cylinder? A cylinder is a circle moved through space to make a solid form. The ends are circles that are in parallel planes, and the sides of the cylinder are the line segments that connect the circumferences of the two circles. Because the circular ends run parallel to [...]

Who was Archimedes? Eureka!

By |2018-04-23T13:58:51+00:00July 18th, 2017|History|

Syracuse, Sicily, with Mount Etna in the background Archimedes was born about 287 BC, so he was a little younger than Euclid. Archimedes' father was an astronomer. Because Archimedes was related to the tyrant who ruled Syracuse, on the island of Sicily, he lived his whole life in Sicily, except when he went to study at the University of [...]

Math and Numbers in Ancient China

By |2018-04-25T12:09:29+00:00June 7th, 2017|China, Science|

Chinese numbers: number rods Chinese numbers People in China were using written numbers by about 1500 BC, in the Shang Dynasty. This is about two thousand years later than people began to write numbers in West Asia. It's more than a thousand years later than people began to write numbers in India. Nobody knows whether [...]