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In 1928, Sir Alexander Fleming discovered penicillin, a type of mold that is used in several medicines. He left the sample of bacteria out in his laboratory while he was on vacation. He came back to find that a mold spore had gotten into the sample. The bacteria had not grown in the spot where the mold was.
Sir Alexander Fleming was not the first person to see the penicillin mold. However, he was the first to realize how important it was. Other scientists found out that the mold could be used to treat many diseases