24. Millions of Lives Saved Because of a Mistake
One day in 1922, while battling a cold, Fleming transferred some of his snot to a Petri dish. A slob, he put it on his cluttered desk, then forgot it for a couple of weeks. When he finally remembered and examined it, the Petri dish was full of bacterial colonies. However, the microscope revealed that one area of snot was free of bacteria. Further examination revealed that it was due to the presence of an enzyme, which he called lysozyme, which had some antimicrobial properties. That laid the groundwork for his discovery of penicillin.
In 1928, Fleming, still a lab slob, left an uncovered Petri dish next to an open window, where it became contaminated with fungus spores. When he checked it under the microscope, Fleming discovered that the bacteria near the fungus were dying. He managed to isolate the fungus, and discovered that it was effective against numerous pathogens that caused diseases such as pneumonia, meningitis, diphtheria, scarlet fever, gonorrhea, and many more. Thus, penicillin was discovered. As Fleming put it: “I did not discover penicillin. Nature did that. I only discovered it by accident“.
