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The history of isotopes fittingly commences with the discovery of radio-thorium, a new product in the thorium disintegration series, by Sir William Ramsay and Otto Hahn in 1905...

— Frederick Soddy The Origins of the Conception of Isotopes (1922)

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More quotes by Frederick Soddy

Chemistry has been termed by the physicist as the messy part of physics, but that is no reason why the physicists should be permitted to make a mess of chemistry when they invade it.

The world that is dead vitally and spiritually is not dead physically.

Matter, Energy, Consciousness and Spirit (1919)

The path hewn by knowledge through ignorance points two ways in the direction of the absolute unattainable truth. Man has always tended to confound these two classes of the ultimately unknowable.

Matter, Energy, Consciousness and Spirit (1919)

There is no life—body, mind or soul...— no birth, growth or even existence, without a continuous supply and expenditure of energy.

Matter, Energy, Consciousness and Spirit (1919)

The self-contained organism is not comprehensible, but the combination of an inanimate mechanism and an external will is more intelligible.

Matter, Energy, Consciousness and Spirit (1919)

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Quote text and notes from Wikiquote: Frederick Soddy (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.