Ancient alchemists tirelessly sought after the power of the Philosophers' Stone - a substance that could turn any base metal into pure gold. Considering the consequences of such an ability falling into the wrong hands, they documented their work almost exclusively in coded texts and images.
Luckily for the history of science, we have brilliant minds like Larry Principe who digs deep into the rich, secret history of alchemical discovery and recreates ancient experiments in his Johns Hopkins University laboratory.
YouTube link
(thanks Kirk)
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