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  On February 24th, 2020, we learned of the passing of Katherine Johnson, a NASA mathematician who overcame racism and sexism in the 1950s to play a key role in Project Mercury, the first American spaceflight mission to put a man into orbit and return him safely. Katherine, like many other NASA mathematicians at the time, relied on a Monroe calculator to make the precise calculations required for space travel. The mission required the team to launch the capsul …