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A bed of nails

Children on a bed of nails used for science popularization in Brazil

A bed of nails is an oblong piece of wood, the size of a bed, with nails pointing upwards out of it.^[1] While it appears at first glance that anyone lying on such a "bed" would be injured by the nails, if the nails are numerous enough, the weight is distributed among them so that the pressure exerted by each nail is not enough to puncture the person's skin.^[2]

^ "Phun Physics – Demonstrations". Phun.physics.virginia.edu. Archived from the original on 2018-09-27.
^ Wilson, Tracy V. (2007-06-26). "HowStuffWorks "Lying on a Bed of Nails"". Entertainment.howstuffworks.com.