The discovery of Penicillin
In 1928 a Scottish biologist, Alexander Fleming, was examining petri dishes in which he was growing bacteria. To his surprise, Fleming noticed a spot of bluish-green mold growing on one plate. Curiously, no bacteria were growing near the mold. Fleming hypothesized that the mold, a fungus named penicillin, produced a substance that killed the bacteria that was growing beside it. Fleming’s work led to the development of the first anti biotic.