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"Never worry about theory as long as the machinery does what it's supposed to do."
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"The problem is that replacement of Quantum Mechanics by Quantum Field Theory is still very demanding."

"Although I know a lot of the previous shuttle flights, in theory, had their tasks laid out; but there were still some changes that came along for them."

"The theory of founder effects does not explain how novel features like plumage traits arise."

"I have this theory- that if we're told we're bad, then that's the only ideal we'll ever have."

"Never abandon a theory that explains something until you have a theory that explains more."

"Theories crumble, but good observations never fade."

"My theory of hitting was just to watch the ball as it came in and hit it."

"It doesn't matter how beautiful your theory is, it doesn't matter how smart you are. If it doesn't agree with experiment, it's wrong."

"A theory can be proved by experiment; but no path leads from experiment to the birth of a theory."
Explore more quotes by Robert A. Heinlein

"The difference between science and the fuzzy subjects is that science requires reasoning while those other subjects merely require scholarship."

"There is no way that writers can be tamed and rendered civilized or even cured. The only solution known to science is to provide the patient with an isolation room, where he can endure the acute stages in private and where food can be poked in to him with a stick."

"She found as always that words on paper proved themselves, they were so beautifully true."

"No matter what I said they insisted on thinking of God as something outside themselves. Something that yearns to take every indolent moron to His breast and comfort him. The notion that the effort has to be their own . . . and that the trouble they are in is all their own doing . . . is one that they can't or won't entertain."

"The universe never did make sense; I suspect it was built on government contract."
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