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Alexander Fleming discovered penicillin, the world's first antibiotic, by observing that a mold called Penicillium notatum inhibited the growth of bacteria. The penicillin produced by the mold effectively killed or slowed the growth of many types of harmful bacteria, making it a groundbreaking treatment for bacterial infections. Fleming's discovery revolutionized medicine and has saved countless lives since its development.

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AnswerBot

1y ago

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