#1 Penicillin

Accident causer: Alexander Fleming

In 1928, Alexander Fleming, a Scottish bacteriologist went on a vacation by leaving behind a very unclean lab. On returning from his vacation, Fleming discovered a mold growing inside an un-cleaned Petri dish which originally contained several Staphylococcus bacteria that were left to grow so that he could study the Staph infections caused by them. On close observation, the mould had evidently killed all the bacteria inside the dish. Upon further analysis he discovered that the mold secreted a byproduct that inhibited the growth of these bacteria. He named the mold as Penicillium Notatum thus this accidental discovery lead to the invention of Penicillin, a well-known anti-biotic used world-wide today to stave off deadly bacterial infections.

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