A friend of mine in Canada works in IT. This came up on her dev server this morning and she posted it out to our shared online community. It comes from Dr. Carl Sagan's 1987 CSICOP keynote address.
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 happened in politics or religion.
Some comments are timeless and always appropriate.