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The History Behind a Slave's Bill of Sale
On a worn, aged piece of paper dated 1835, a judge describes the sale of a 16-year-old girl named Polly, with "yellow complexion and black eyes"
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Did You Know? Cinco de Mayo Celebrates the Battle of Puebla
The lesser known backstory behind the popular holiday
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Scanning a Stradivarius
Medical 3-D imaging makes it possible to study the world's greatest stringed instruments – and uncover the secrets of its makers
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