Mario Livio is an astrophysicist who worked for 24 years with the Hubble Space Telescope and a best-selling author of popular science books; his most recent one is Why?: An Exploration of Human Curiosity (Simon & Schuster, 2017).
Steve Mirsky has been writing the Anti Gravity column since a typical tectonic plate was about 36 inches from its current location. He also hosts the Scientific American podcast Science Talk.
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