An undefined problem has an infinite number of solutions.
Robert A. Humphrey 

Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius -- and a lot of courage -- to move in the opposite direction.
Albert Einstein (1879-1955) 

Anyone who considers arithmetical methods of producing random digits is, of course, in a state of sin.
John von Neumann (1903-1957) 

Anyone who has never made a mistake has never tried anything new.
Albert Einstein (1879-1955) 

Art and science have their meeting point in method.
Edward Bulwer-Lytton 

As soon as questions of will or decision or reason or choice of action arise, human science is at a loss.
Noam Chomsky 

Basic research is what I'm doing when I don't know what I'm doing.
Wernher Von Braun (1912-1977) 

Before a war military science seems a real science, like astronomy; but after a war it seems more like astrology.
Rebecca West 

Celestial navigation is based on the premise that the Earth is the center of the universe. The premise is wrong, but the navigation works. An incorrect model can be a useful tool.
Kelvin Throop III 

'Contrariwise', continued Tweedledee, 'if it was so, it might be, and if it were so, it would be; but as it isn't, it ain't. That's logic!'
Lewis Carroll  - Alice in Wonderland