Giant Steps (First of Eight) -- The hormones injection is one of medicine's newest aids in the battle against crippling and killing diseases. Antibiotics have helped lower the U.S. death rate by 25 percent since 1920, combatting tuberculosis and pneumonia. When the Du Pont Company's Magazine, "Better Living," asked science, education and publishing experts to name the top chemical advances since 1920, Antibiotics was one of the Three developments to get everyone's vote, The others were synthetic fibers and synthetic plastic. A total of 27 chemical achievements were named by the nine experts. Survey was made in connection with Chemical Progress Week, May 16 to May 21, which will honor the chemical industry one of the forces that alter and shape the ***** scene. April 22, 1955. (Photo by United Press).