The Mpemba effect: why does hot water freeze faster than cold?

The Mpemba effect: why hot water freezes faster than cold

The puzzling Mpemba effect has been successfully modelled, explaining a paradox that baffled Aristotle and Rene Descartes alike.

The Mpemba effect
In certain conditions, hot water can freeze more rapidly than cold. Credit: Koichi Kamoshida/Getty Images
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