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What happened on September 15 in history? This is the story Historai has told for this date. Listen, or read the transcript and sources.
September 15, 1928
Alexander Fleming's discovery of penicillin on September 15, 1928
A cluttered London lab, a summer holiday, and a mould that drifted onto the wrong dish. The man who noticed couldn't make the medicine — so who did, and why did it take a world war?
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