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President Harry S. Truman delivered the first televised presidential address from the White House to a limited audience. it happened on Oct. 5, 1947.
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The first transistor this was perhaps the most important electronics event of the 20th century, as it later made possible the integrated circuit and microprocessor that are the basis of modern electronics. Prior to the transistor the only alternative to its current regulation and switching functions (TRANSfer resISTOR) was the vacuum tube, which could only be miniaturized to a certain extent, and wasted a lot of energy in the form of heat. Although video was possible with vacuum tube equipment,
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In 1954, in response to the Communist threat of the times, President Eisenhower encouraged Congress to add the words "under God," June 14, 1954. Eisenhower stated "In this way we are reaffirming the transcendence of religious faith in America's heritage and future;
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Dr. Thomas declared the vaccine to be safe and effective on April 12, 1955.Thomas Francis Jr. (L)
and Jonas Salk (R) on April 12,
1955 at Ann Arbor announcement
polio vaccine field trial success -
In 1954, 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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NASA stands for National Aeronautics and Space Administration. It is the agency of the United States government that is responsible for the nation's civilian space program.
