Which bacterium was Alexander Fleming trying to grow when he accidentally discovered penicillin in 1928?
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Upon returning from a summer holiday, Alexander Fleming found that a mold had contaminated his Petri dishes of Staphylococcus aureus. He noticed that the bacteria immediately surrounding the mold were dying off. This led to his realization that the mold secreted a self-defense substance, which he named penicillin. Photo: Official photographer, Wikimedia Commons, Public domain.
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Source: Wikipedia (CC BY-SA)
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