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" 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. "

Dmitri Mendeleev

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" We could live at the present day without a Plato, but a double number of Newtons is required to discover the secrets of nature, and to bring life into harmony with the laws of nature. "

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" 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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" 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). "

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

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" There is nothing in this world that I fear to say. "

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" There exists everywhere a medium in things, determined by equilibrium. "

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" The most all penetrating spirit before which will open the possibility of tilting not tables, but planets, is the spirit of free human inquiry. Believe only in that. "

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" Certain characteristic properties of elements can be foretold from their atomic weights. "

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" The elements which are the most widely diffused have small atomic weights. "

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" Work, look for peace and calm in work: you will find it nowhere else. "

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" I have achieved an inner freedom. "

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" 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. "

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" No one nor anything can silence me. "

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" 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. "

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

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