Why a pin-prick hurts?
Human body is covered with skin. This skin is made up of several layers. Beneath the outermost layer are found millions of very small points. These are connected to a number of little threads called nerves. When the skin is pressed upon or touched, the nerves communicate the sensation to the brain. Thus the skin with the little nerves provides us with one of the five senses - "touch". If a pin goes into the outer layer and touches one of these little points, the touch becomes "pain"
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