Thanks to its thick coat of fur, its tough hide, and a four inch layer of blubber, a polar bear is extremely well insulated.
It neat, it's educational, and best of all, it doesn't involve anything that could explode or become poisonous or make a terrible smell.
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Back when most folks relied on an icebox to cool food, a block of ice was a precious commodity.If you put hot food in the icebox the ice might melt, and by the time the ice truck came through the neighborhood again all your food may have spoiled.
While in the tube, the worm’s tail end might be immersed in temperatures as hot as 178 degrees Fahrenheit, while its head rests in cooler water, as moderate as 72 degrees Fahrenheit.