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"No law of nature, however general, has been established all at once; its recognition has always been preceded by many presentiments."
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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 Dmitri Mendeleev

"I want you to have this feeling too - it is my moral responsibility to help you achieve this inner freedom."

"The magnitude of the atomic weight determines the character of the element, just as the magnitude of the molecule determines the character of a compound body."

"Pleasures flit by - they are only for yourself; work leaves a mark of long-lasting joy, work is for others."

"We must expect the discovery of many as yet unknown elements-for example, elements analogous to aluminum and silicon- whose atomic weight would be between 65 and 75."

"Elements which are similar as regards their chemical properties have atomic weights which are either of nearly the same value (eg. Pt, Ir, Os) or which increase regularly (eg. K, Ru, Cs)."

"The establishment of a law, moreover, does not take place when the first thought of it takes form, or even when its significance is recognised, but only when it has been confirmed by the results of the experiment."

"It is the function of science to discover the existence of a general reign of order in nature and to find the causes governing this order. And this refers in equal measure to the relations of man - social and political - and to the entire universe as a whole."
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