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Noble Prize winner Alexander Fleming, born Aug. 6, 1881 was a great Scottish biologist and pharmacologist who made way for antibiotic medicines with his discovery of penicillin from the mould "Penicillium notatum".

Andrew Carnegie was a Scottish-American industrialist who led the enormous expansion of the American steel industry in the late 19th century. He was also one of the most important philanthropists of his era.

Sir Alexander Fleming -- Discovered antibiotics--- one of the most important contribution to the human race.

Hippocrates was a Greek physician born in 460 BC on the island of Cos, Greece. He became known as the founder of medicine and was regarded as the greatest physician of his time. He based his medical practice on observations and on the study of the human body. He held the belief that illness had a physical and a rational explanation. He rejected the views of his time that considered illness to be caused by superstitions and by possession of evil spirits and disfavor of the gods.

God Bless Dr. Salk: Jonas Edward Salk (1914-1995) American medical researcher and virologist, best known for his discovery and development of the first safe and effective polio vaccine.

Sir Alexander Fleming FRSE, FRS, FRCS (Eng) (6 August 1881 – 11 March 1955) was a Scottish biologist and pharmacologist. He wrote many articles on bacteriology, immunology, and chemotherapy. His best-known discoveries are the discovery of the enzyme lysozyme in 1923 and the antibiotic substance penicillin from the mould Penicillium notatum in 1928, for which he shared the Nobel Prize in Physiology or Medicine in 1945 with Howard Florey and Ernst Boris Chain.