In 1928, Alexander Fleming Returned From Vacation: Found Mold in a Petri Dish and Discovered Penicillin, Changing Medicine Forever

A forgotten petri dish led to a groundbreaking discovery. Alexander Fleming observed mold inhibiting bacteria, a finding later developed into penicillin. This antibiotic revolutionized medicine, transforming infections from deadly threats to treatable conditions. Penicillin's impact saved countless lives, particularly during World War II, and enabled advancements in surgery and transplants.