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white house speech on tv
On this day in 1947, President Harry S. Truman delivered the first televised presidential address from the White House — to a limited audience. Television was still in its infancy: There were only about 44,000 TV sets in U.S. homes, concentrated in a few cities, compared with some 40 million radios. -
transistor
tiny circut device that generates amplifies and controlls electic signals -
under god was put into pledge of allegiance
Louis A. Bowman was the first to initiate the addition of "under God" to the Pledge. The National Society of the Daughters of the American Revolution gave him an Award of Merit as the originator of this idea. -
polio vaccine
dr jonas salk created a vaccine for polio. it was created as an injection, dr.albert sabin used salks help and created an oral vaccine. -
nuclear power plant
the first one ever, started in shippingport, pa. -
nasa
official start of the National Aeronautics and Space Administration (NASA), was the beginning of a rich history of unique scientific and technological achievements in human space flight, aeronautics, space science, and space applications
