The once-surprising existence of non-Euclidean models of Euclid's first four axioms can be seen as a sort of mathematical joke.
John Allen PaulosThe Internet is the world's largest library. It's just that all the books are on the floor.
John Allen PaulosUncertainty would be the only certainty there's, and realizing how to stay with insecurity could be the only protection
John Allen Paulos