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"If we knew exactly the laws of nature and the situation of the universe at the initial moment, we could predict exactly the situation of the same universe at a succeeding moment."
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"Clear skies do not promise rain."

"What is a weed? A plant whose virtues have not yet been discovered."

"A puddle repeats infinity, and is full of light; nevertheless, if analyzed objectively, a puddle is a piece of dirty water spread very thin on mud."
Explore more quotes by Henri Poincare

"Absolute space, that is to say, the mark to which it would be necessary to refer the earth to know whether it really moves, has no objective existence."

"It has adopted the geometry most advantageous to the species or, in other words, the most convenient."

"A very small cause which escapes our notice determines a considerable effect that we cannot fail to see, and then we say that the effect is due to chance."

"A sane mind should not be guilty of a logical fallacy, yet there are very fine minds incapable of following mathematical demonstrations."

"What is it indeed that gives us the feeling of elegance in a solution, in a demonstration?"

"If nature were not beautiful, it would not be worth knowing, and if nature were not worth knowing, life would not be worth living."

"If that enabled us to predict the succeeding situation with the same approximation, that is all we require, and we should say that the phenomenon had been predicted, that it is governed by the laws."
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