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Physics professor demonstrates a ping-pong cannon.
The American form of government.
17 gigapixel photo.
How plastic bottles can lighten up the darkness.
Floating cube optical illusion.
Hilarious woman calls into the Ellen Degeneres show.
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Derek Clark earns his reputation as the rapping dad in this video as he has his son record while he's driving. Clark is also a motivational speaker and the author of six books, and writes his lyrics as journals of his life.