Most manatees die from collisions with watercraft or from "cold stress" in chilly waters, Baxter said.

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Reduced cold stress provides some benefits.

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Both extremely hot and cold temperatures stress our electrical grid to the breaking point, and there is precious little in reserve.

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They need a cold, dispassionate environment that will let them reconsider their options and to stress test them very rigorously.

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That's caused by the adrenaline and stress hormones that the body releases in response to the shock of the cold temperature, but experts say that these rushes are not as healthy as people think.

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