In science it often happens that scientists say, "You know that's a really good argument; my position is mistaken," and then they actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that has happened in politics or religion.
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Citation
Sagan, Carl. "The Burden of Skepticism." CSICOP conference. 3 Apr. 1987, Pasadena, CA, USA. Keynote address.
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