De Forest obtained his degree in 1899 and was interested in wireless telegraphy which led to his invention of the audion tube[?] in 1906. The audion tube is a vacuum tube which allowed for voice amplification for radio reception. De Forest said he didn't know why it worked, it just did.
He went on to lead the first radio broadcasts of music (featuring opera star Enrico Caruso) and many other events but could receive little backing. In the early 1920s, he invented talking movies but could interest no one in Hollywood in his invention at the time.
He sold one of his radio manufacturing firms in 1931 to RCA. He died in Hollywood in 1961.
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