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An engraving by W.T. Fry (based on a painting) of Mary Stuart, also known as Mary Queen of Scots, circa 1587. An international trio of codebreakers discovered and decrypted letters she wrote during her years in captivity in England. Hulton Archive/Getty Images hide caption

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Hulton Archive/Getty Images

3 amateur codebreakers set out to decrypt old letters. They uncovered royal history

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