The last wild case of polio was recorded in the U.S.
In 1979, the last wild case of polio was recorded in the U.S. However, in 1993, the virus…
In 1979, the last wild case of polio was recorded in the U.S. However, in 1993, the virus…
On Apr. 10, 1972, the United States, the Soviet Union and 70 other nations signed an agreement that…