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20th Century(1900's)
Health began to define more terms in longevity. How long a person lives as well as the quality of life.
1940's antibiotic was introducing for widespread use. Penicillin was the first to be marketed in the 1920s, and in 1944 it was commercially available.
1981 HIV/AIDS emerged more than 600,000 men, women, and children have died because of HIV diseased worldwide.