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More than 2,000 years of elements: a prehistory of the periodic...

Personifications of the principles of mercury and sulfur, from the sixteenth century.Credit: Wellcome Collection More than two millennia before the periodic table was conceived, ancient philosophers were already grappling with the nature of ‘stuff’ in the world. Are all substances reducible to the same, universal matter? If so, when exactly does one substance become distinct…

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