Smelting of copper: making liquation cakes by reducing copper in furnaces and alloying with lead, 1683. From an English edition of German metallurgist Lazarus Ercker's Beschreibung allerfurnemisten mineralischen Ertzt und Berckwercksarten, 1580. (Photo by Ann Ronan Pictures/Print Collector/Getty Images)
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January 27th, 2021
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