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Experts crack the secret to last letter of Mary, Queen of Scots before her execution

Mary, Queen of Scots was executed in 1587. Researchers have shed new light on how she safeguarded the final letter that she wrote on the eve of her execution, using a technique known as the spiral lock. (Getty Images)
Mary, Queen of Scots was executed in 1587. Researchers have shed new light on how she safeguarded the final letter that she wrote on the eve of her execution, using a technique known as the spiral lock. (Getty Images)

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