Intellectual Honesty

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In science it often happens that scientists say, "You know that's a really good
argument; my position is mistaken," and then they would 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 happened in politics or religion.

Carl Sagan