Since the Civil War, Americans have taken a day in late May to honor fallen soldiers. Learn two theories on how this tradition began in today's episode of BrainStuff.
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How Did Wild Bill Hickok Become America's First Gunslinger?
12:40

What Colors Are Impossible?
14:05

BrainStuff Classics: What's the Controversy Behind 'Mary Had a Little Lamb'?
06:30