On this day: Polio vaccine announced as safe and effective i

On this day: Polio vaccine announced as safe and effective in 1955

Following are some of the major events to have occurred on April 12:1945 - Franklin Roosevelt, U.S. president for a record four terms, died in office. Vice President Harry Truman took over and completed his term of office.1954 - Bill Haley and the Comets recorded the song Rock Around the Clock. It s

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