Hot water can freeze faster than cold water — it's called the Mpemba effect, and physics still can't fully explain it. In this video you learn: how a Tanzanian schoolboy's 1963 ice cream experiment gave the phenomenon its name; that Aristotle observed the same paradox over 2,000 years earlier; and the leading explanations — evaporation, supercooling, and dissolved gases — none of which fully settles the debate.
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