The discovery of penicillin
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Position 1: Curiously, the bacteria around the mould had been destroyed, while those further away continued to grow.
Position 2: Recognising the significance of this observation, he identified the mould as Penicillium and named its active substance penicillin.
Position 3: It would take more than a decade, however, before other scientists turned this discovery into a usable, mass-produced antibiotic.
Position 4: In 1928, Alexander Fleming returned from holiday to find that a mould had contaminated one of his bacterial cultures.
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