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Truman was the first president to talk to the nation of television. He adressed them from the White House. In this broadcast, he asked Americans to refrain from eating meat on Tuesdays, and poultry and eggs on Thursdays, to help stockpile grain for starving people in Europe.
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The Transistor was invented in November 1947. A tiny circuit device that amplifies, controls, and generates electrical signals. The transistor could be used in radios, computers, and other electronic devices, and greatly changed the electronics industry.
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Congress and President Eisenhower added the words "under god" to the pledge. It was after after a campaign by the Knights of Columbus. The Pledge was now both a patriotic oath and a public prayer.
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In June 1954 Dr. Jonas Salk and Dr. Thomas Fracis developed the polio vaccine. Polio or Poliomyelitis was a disease that entered the body through the mouth or the nose. It attacks the muscles in your body and you cannot walk.
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In July 1958 the Navy produced the first nuclear-powered submarine, which had a small reactor in the hull. The submarine's technology provided a model for the first nuclear power plant on land, which opened in Shippingport, Pennsylvania.
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The U.S government created NASA as an independent agency for space exploration. They needed to keep up with the soviet union when the russians sent the sputnik up to space. NASA stood for Nationsl Aeronautics and Space Administration.
