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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 [...] How do the body’s own electric currents work? asks a reader. In “I Sing the Body Electric,” a story by Ray Bradbury, an “electric grandmother” arrives to take care of a family of motherless children. This “grandmother” was a robot, but human grandmothers–and children–are electric, too. In fact, every body is electric. Just as the [...] |
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