On a cool day Scottish bacteriologist Alexander Fleming returns from holiday to discover piles of culture dishes with bacteria lying around, he left a window open in his lab, he notices that one of the dishes is contaminated with a greenish yellow mould . Fleming then notices that between the mould and the bacteria is a clear halo where the bacteria had not grown.
In a eureka moment he realises that the mould must be releasing a substance that is stoping the growth of the bacteria. Fleming names the active ingredient of his mould 'Penicillin' after the Penicillium notatum mould from which it comes.
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