La chair de poule sur le corps humain est un vestige de quand nous avions beaucoup de poils sur le corps. Lorsqu’on a peur, nos poils se gonflaient pour que l’on paraisse plus grand et ainsi faire peur aux prédateurs.
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Euh, en fait je crois que c’est plutôt quand on a froid, les poils se hérissent pour emprisonner de l’air entre la peau et les poils qui sera chauffé par le corps. C’est un vieux réflexe plutôt inutile aujourd’hui.