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Alexander Fleming discovered penicillin, he left it in a petri dish for 2 weeks whilst he was on holiday when the got back there was a ring shape of mould, he then tested it on 8 mice and 4 were given penicillin they lived, four weren't and they died! To me this answer is good as it helped four mice survive, it also helped soldiers get better in World War 1!

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12y ago

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