for reasons unexplained, every person in the world is born with a large gaping hole in the center of their chest.
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while not uncomfortable, it is widely considered unsightly, and pretty much everyone tries to fill it with something.
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some people fill it with religion, others just buy a bunch of stuff, and some even fill it with other folks.
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i left mine alone, though because i found out if you run against the wind at just the right angle, it makes awhistling noise