Thursday is National High Five Day, celebrating one of the most ubiquitous hand gestures in the world. But while plenty of people have high-fived before, few know the high five's surprising history.

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MANHATTAN (WABC) -- Today is National High Five Day. For David Hale Sylvester, who has hugged and high-fived more than half a million people, it might as well be Christmas. "My plan was not to ...