In fact, it would be an alchemist, Phillipus Theophrastus Aureolus Bombastus von Hohenheim (what a mouthful!), better known as Paracelsus, who would first challenge the ancient Greek wisdom when he proposed the existence of three spiritual substances: mercury, sulfur and sat. Less than two centuries later, while trying to isolate the philosopher's stone, that long sought-after legendary substance capable of turning base metals into gold, the German alchemist Hennig Brand would unwittingly become the first person in history to isolate an element in its pure form... and I bet you'll never guess where he found it :)
Once this spark was kindled, it would not be long until more and more elements were discovered and the revolutionary science of chemistry was established by luminaries such as Antoine Lavoisier, Joseph Priestley, Robert Boyle and Humphry Davy, but there was one more major and subtle theoretical hurdle that had to be overcome first: the ever-elusive phlogiston... which managed to elude everyone mainly because it turned out not to exist :)
Check out Joseph Priestley's contribution to the discovery of oxygen, Lavoisier's contribution to Einstein's e=mc2, or his contribution to the understanding of cold.
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