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Recreations
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Home of Simon Singh: author, journalist and TV producer, specialising in science and mathematics. Cryptography is one of his specialties, and his site has a lot of educational and fun content about codes and codebreaking.
http://www.simonsingh.net/
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Features interesting facts about different numbers. Includes favorite related links.
http://www.shyamsundergupta.com/
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Includes puzzles, jokes, quotations, poetry, and FAQs.
http://www.mathmos.net/
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Topics include Flexagon, Soma Cube, Pentominos, Cube-it, Rubik's Cube, Froebel's Star, Tangram, House of Santa Claus, Chronogram, Numeric Palindromes, Latticework of Letters. English/German.
http://www.mathematische-basteleien.de/
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Individual pages on different topics in Mathematics. Examples : group theory, dynamical systems theory, geometry or number theory.
http://www.mathematik.com/
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Include news, math tricks, methods, facts, trivia, mostly posted by users.
http://www.curiousmath.com/
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