Carl Sagan Day is celebrated on his birthday, November 9.
How are you going to celebrate?
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 someting like that happened in politics or religion.----Carl Sagan, 1987 CSICOP Keynote Address
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