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Chemist Leo Sternbach works in a lab at Hoffmann-La Roche Inc. pharmaceutical company in this company photo from the early 1970s in Nutley, N.J. Sternbach is best known for inventing the tranquilizer drug Valium, which became one of the most prescribed drugs in the U.S. Valium, the drug that revolutionized the treatment of anxiety and became a household name and cultural icon, is 40 years old this year. (KEYSTONE/AP Photo/Hoffman-La Roche)