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How come ice is so slippery? asks Rebecca Anderson, a student in Brookville, NY. If you’ve ever careened into the sink on your way across the kitchen in the morning, you know a patch of spilled water is slippery. On a dry floor, the friction between your shoes and the floor’s surface keeps you from [...] Why does putting on a coat in cold weather make us warmer? asks a reader. Go out lightly dressed on a frigid day, and thermal energy will quickly drain away from you into the cold December air. But unlike a run-down mechanical bunny, you don’t need new batteries. A warm coat pulled from the back [...] |
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