The world is in the state it is today because of a lot of wrong guesses about how things work. (dotearth.blogs.nytimes.com)
No point is lost for wrong guesses or missed words. (educationworld.com)
I leave it upto you, to work out the probability if all the hundreds of the unknown facts were guesses, the chances of all of them being correct guesses simultaneously and there being not a single wrong guess. (religion.blogs.cnn.com)