Question

why don't people lying on a bed of nails feel pain? Explain your answer.

Answer 1

because the blood pressure goes down

Answer 2

It appears to the spectator that anyone lying on this "bed" would be injured by the nails, but this is not so. Assuming 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.
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