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Fleming's Discovery of Penasilon
Alexander Fleming's discovery of penacillon was an accident. He cultured his own mucus in a petry dish, and then later discovered that the area around the mucus wasn't growing bacteria. In some versions of this story, his office was perpetually untidy, and this petri dish had sat there forgotten for a couple of weeks before he made the discovery. We don't know exactly where the mould containation came from. One possibility is an open window, and another is a mychology lab that was in the same building. And this discovery was only possible because the petry dish was left out on a bench.