Why was Alexander Fleming so important?

Answer 1

Alexander Fleming was a doctor and bacteriologist who discovered penicillin, receiving the Nobel Prize in 1945.
Penicillin was the first antibiotic we ever had. His discovery was accidental but he was able to see the process behind it. He noticed that, on a plate used in Microbiology labs, that there was mold that wasn't supposed to be there. He also noticed that there was space around the mold and the bacteria growing there. The mold was making something that prevented the bacteria from growing any closer.
When he studied that clear area, a product made by the mold was what prevented the bacteria from growing. The mold was Penicillin notatum. The product was called penicillin.