Carl Sagan (1934–1996) grande cientista do séc XX, criador da aclamada série Cosmos: An Personal Voyager e desenvolvedor no conteú…
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.
Keynote address at CSICOP conference, 1987