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Alexander Fleming left his laboratory in August 1928 for summer holiday. The weather was shifty. Cool in June, hot in July, and cooling off again in August. It affected the cultivation of bacteria he was growing in a petri dish for his book on bacteria. The weather was perfect for mold. Somehow the spores of Penicillium (a name you may recognize) got into his laboratory and fell into the petri dish. As both the bacteria and the mold grew, something interesting happened. The mold killed the bacteria it came in contact with. When Fleming returned, he noticed what had happened. It was intriguing. Fleming saved the plate and samples. But it would be 12 years before anything would come from this accidental discovery.


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