The penguins are immune to facial frostbite, but humans need to wear a pantsaclava in bed at night to keep the ears from freezing solid.
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It's almost enough to make me long for the old days in Australia, where I used to scoff at the wimpish winters. In Sydney, no sooner had you dug out your hot water bottle than winter was all over and the pullovers were packed away for another year.