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Penicillin

In Our Time

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The Unrepeatable Accident at Transformed History

Mold grows where you have bacteria in a particular location. The chances of a mold producing something which was chemically useful landing on a plate next to the bacteria would be vanishingly small. It's not more likely this mold actually came up through a lift shaft in the building at St. Mary's from a lab below, which was studying molds. Incredible accident, remarkable accident at transformed history, really.

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