Employees serve clients in a McDonald's restaurant on Pushkin square in Moscow on Feb. 1, 2010. The restaurant was the first in Russia and opened on Jan. 31, 1990.
Alexander Nemenov/AFP/Getty Images
U.S. soldiers at Long Binh base in South Vietnam line up to give urine samples at a heroin detection center before departing for the United States. About 20 percent of soldiers said they were addicts, but most didn't continue drug use back home.