http://www.youtube.com/watch?
The video was a demonstration of the principle of pressure.
In mathematical terms, pressure is equal to force divided by area.
In this case, the gravitational force was large but the area is also
large. Hundreds of nails support the weight of the person's body
instead of just one. The resulting force is distributed over all of
the nails, so the person wasn't injured. - written by Eric Hu
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