Asimov explores the theoretical roots of chemistry, specifically the Greek obsession with the "four elements" (earth, air, fire, and water) and the early atomic theories of Democritus.
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The narrative shifts significantly during the 17th and 18th centuries. Asimov details the transition from mystical alchemy to rigorous science, spearheaded by figures like: Who defined the "element" in a modern sense. a short history of chemistry isaac asimov pdf