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Unusual Counting Systems

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Is Zero an Even or an Odd Number?

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Why Is It Called Black Friday?

Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.

10 Famous Artworks by Leonardo da Vinci

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America’s 5 Most Notorious Cold Cases (Including One You May Have Thought Was Already Solved)

The Cheshire Cat is a fictional cat from Lewis Carroll's Alice's Adventures in Wonderland. (Alice in Wonderland)

11 Banned Books Through Time

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12 Novels Considered the “Greatest Book Ever Written”

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Pro and Con: School Uniforms

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