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"Theories pass. The frog remains."
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"Never worry about theory as long as the machinery does what it's supposed to do."

"The problem is that replacement of Quantum Mechanics by Quantum Field Theory is still very demanding."

"Of thousands of others, nearer the centre of the explosion, there was no trace. They vanished. The theory in Hiroshima is that the atomic heat was so great that they burned instantly to ashes - except that there were no ashes."

"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."

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

"Theories crumble, but good observations never fade."

"My theory is this; I'm not a political songwriter. I'm an honest songwriter."

"I have this theory- that if we're told we're bad, then that's the only ideal we'll ever have."
Explore more quotes by Jean Rostand

"Falsity cannot keep an idea from being beautiful; there are certain errors of such ingenuity that one could regret their not ranking among the achievements of the human mind."

"I don't judge a regime by the damning criticism of the opposition, but by the ingenuous praise of the partisan."

"It may offend us to hear our own thoughts expressed by others: we are not sure enough of their souls."

"Somebody told me I should put a pebble in my mouth to cure my stuttering. Well, I tried it, and during a scene I swallowed the pebble. That was the end of that."
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