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Napier's Bones
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Napier's Bones was designed in 1617 by John Napier a Scottish Mathematician. In its day it was a wonderous device that simplified complex multiplication and other math processes such as long division and square roots. It was essentially the first calculator and was in common use for nearly 3 centuries. This is something I find wonderfully elegant in understanding and explaining ho...
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Trans Pride / Transgender Pride Flag Beanie Hat - LGBTQ Pride Cap
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