Gifts by Interest
Math Gifts
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The Untold Story of the American Women Code Breakers of World War II
A popular collection of classic math and logic puzzles first published in the Soviet Union in 1956
Beautifully crafted books from the world of science, technology and natural history
A historical look at the world of codes and ciphers, from ancient Egyptian texts to cutting edge quantum cryptography
Hilarious scientific answers to absurd hypothetical questions, from the creator of the wildly popular webcomic xkcd
