I believe shutting up about what you believe is a way to stay close-minded, a way not to be busted. If you have some crazy thought and keep it in your head, there is much less chance that someone will say, 'what are you, fucking nuts?' One of the quickest ways to find out if you are wrong is to state what you believe.

—Penn Jillette

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Arguably the most famous mistake in the history of science, geocentrism – the belief that the earth is the center of the universe – held sway in the West from ancient Greece until the late 16th century. This erroneous conviction was supported by basic but misleading sensory observations (to the human eye, the sun appears to revolve around the earth, while the ground beneath us feels stationary), as well as by many religious traditions, including Judeo-Christianity. It took the combined work of the astronomers Copernicus, Galileo, and Kepler – plus about a century and a half of sluggish belief change – for the correct, heliocentric model of the solar system to become broadly accepted.