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Why do lizards do pushups? What if the Earth’s magnetic field reverses? How do stars die? What causes goose bumps, earwax, dandruff, headaches? Whether it’s healthy to crack your knuckles, drink decaf, eat chocolate? What it costs to run all those LED lights around your house? These are just a few of the fascinating science and health questions real people have asked top science writer and San Diego Union-Tribune columnist Sherry Seethaler. This collection brings together 350 of her best answers–all crystal-clear, accurate, quick, and a pleasure to read. Seethaler is one of this generation’s best science explainers, and it shows: Every answer is accurate, fun to read, and distilled to a single page or less!