Template:Are You Sure/January 18
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• ... that physicist, mathematician, astronomer, and musician Jean-Pierre Christin proposed (1743) the reversal of the Celsius thermometer scale (from water boiling at 0 degrees and ice melting at 100 degrees, to where zero represented the freezing point of water and 100 represented the boiling point of water), and that his system was widely accepted and is still in use today?