On September 28, 1928, Sir Alexander Fleming noticed a bacteria-killing mold growing in his laboratory. This was a discovery that changed the course of history.
Fleming said, “I did not invent penicillin. Nature did that. I only discovered it by accident.” Indeed, he was not the first one to use penicillin properties, but he was the first to isolate the active substance which he named penicillin and to study its antibacterial activities.
Fleming was awarded the Nobel Prize for Medicine in 1945, which he shared with Howard Florey and Ernst Chain, the two men who developed it.