Find out what happened on November 21 in our This Day in History video. On November 21, 1783, history was made in the skies over Paris when the first manned un-tethered air balloon flight took place. On November 21, 1877, Thomas Edison had another idea. Edison created a device that could record and playback sound. On November 21, 1973, the Nixon Administration announced that there was an eighteen and a half minute gap on the Watergate tapes. Still no one knows what was said in that gap. Lastly, on November 21, 1980, 350 million people tuned into an episode of Dallas to see who shot J.R. It turned out to be an upset mistress.