Tim Gratz has posted this in the history section. I think it is worth adding to the science section.
There was an interesting article in the editorial section of the Sunday, January 2, 2005 New York Times, called "Even Einstein Had His Off Days".
The article discusses how Einstein, after looking through the Hubble telescope, renounced his static cosmology and endorsed the expanding universe model. Later facts made him question his original theories.
In other words, he was not so wedded to his own theories to refuse to change them when new information was received.
I like the way the article ends:
As we celebrate the Einstein Year, let's bear in mind the fact that he was prepared to admit he was wrong. Perhaps humility, more than anything, is the mark of true genuis.
Author: Simon Singh, author of "Fernat's Enigma".