97 years ago today, on February 13, 1928 (January 22, 1928 in the lunar calendar), British medical scientist Fleming discovered penicillin. Fleming was doing experiments On February 13, 1928, Fleming discovered penicillin. For this reason, he won the Nobel Prize in Physiology and Medicine in 1945 together with British pathologist Florey and biochemist Chain. Alexander Fleming was born in Scotland in 1881. He went to London at the age of 16 and worked in the steamship shipping office. After passing a special examination, he entered the University of London to study medicine. He received a bachelor's degree in medicine in 1906 and a gold medal in 1908. Professor of Bacteriology at the University of London in 1928. Fleming served in France as an army doctor in World War I. Through experiments, he found that the preservative trauma used for the wounded at that time was ineffective or even harmful, so he imagined discovering a "magic bullet" that was fatal to bacteria and beneficial to human body. In 1922, he discovered an antibacterial substance-lysobacterium, which exists in human saliva and other secretions in human body. He was elected a Fellow of the Royal Society of London in 1942 and knighted in 1944. In addition, Fleming has written many papers on bacteriology, immunology, and chemotherapy.