Pre-existing Quotes (2 quotes)
A new theory is guilty until proven innocent, and the pre-existing theory innocent until proven guilty ... Continental drift was guilty until proven innocent.
The Nemesis Affair: A Story of the Death of the Dinosaurs and the Ways of Science (1986), 195-205.
There is no science which does not spring from pre-existing knowledge, and no certain and definite idea which has not derived its origin from the senses.
In Willis (trans.) and Alex Bowie (trans.), 'The First Anatomical Disquisition on the Circulation of the Blood, Addressed to Jo. Riolan', On the Motion of the Heart and Blood in Animals (1889), 93.
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.
(1987) -- 
