The Astronomer Who Defended His Mother From the Stake
In 1620 the seventy-four-year-old mother of Johannes Kepler was arrested for witchcraft. He spent six years getting her out.
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Germany
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The Duel Over an Equation
In December 1566 the 20-year-old Tycho Brahe and his cousin fought in the dark with rapiers over a mathematical disagreement. Tycho lost the bridge of his nose.
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