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Fact
It is called the Mpemba effect, after a Tanzanian schoolboy who noticed in 1963 that hot ice-cream mix froze before cold; Aristotle, Bacon and Descartes had all remarked on it long before. It is notoriously hard to pin down. Evaporation, dissolved gases and currents in the water have all been blamed, and some careful experiments find no effect at all, so the argument is partly about whether it happens.