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Sophie Germain (source)

Sophie Germain, mathematician, was born on April 1, 1776 (source)

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Harriet Quimby in 1911, George Grantham Bain Collection, Library of Congress (source)

April 16, 1912, Harriet Quimby becomes the first woman to fly across the English Channel. Photo: George Grantham Bain Collection, Library of Congress (source)

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