On This Day April 26
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1954 – More than 1.8 million American children (“Polio Pioneers”) participate in the Salk polio vaccine field trials. Dr. Jonas Salk developed the vaccine in an effort to wipe out polio — an infectious disease occurring primarily in children that can result in paralysis. A year later, researchers declare that the vaccine is safe and effective, and it becomes a standard part of childhood immunizations across the U.S.
1969 – The Edwin Hawkins Singers hit the singles chart with “Oh Happy Day,” which eventually soars to No. 4 and million-selling status. It becomes the first gospel track to cross over to the pop chart.
1988 – A jury in White Plains, New York finds Rolling Stones frontman Mick Jagger not guilty of copyright infringement. Reggae singer Patrick Alley had sued Jagger for $7 million over the song “Just Another Night,” claiming the chorus’s lyrics were similar to his version. Jagger provided jurors with a rare glimpse into his work habits by playing homemade and studio tapes demonstrating the development of his song.