Goosebumps

Goosebumps can happen for a variety of reasons, such as temperature, emotions, surprise and sickness. These little bumps occur when very tiny muscles, at each hair shaft's base, contract and make the hair stand straight up. The instinct of goosebumps comes from when we had hair all over our bodies and the puffed up hair made us appear larger and more menacing.
This Post Belongs To Most Common Natural Human Instincts