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Imagine a heart that has completely stopped beating. A body chilled so far below zero that by every law of science, it should be a block of ice. But for the Arctic ground squirrel, this isn't a tragedy—it’s a strategy. While the rest of the world huddles for warmth, this tiny mammal does the unthinkable: it surrenders. It allows its body temperature to plummet to nearly negative three degrees Celsius, the lowest ever recorded in any mammal. It is a process called supercooling. By stripping its b