I've always found goosebumps interesting because they seem like such a strange reaction for the human body to have.

We can get them from listening to music, experiencing a powerful emotion, remembering something, or even hearing a particular sound. Yet the same reaction can happen when we're cold or frightened.

I understand that goosebumps involve tiny muscles attached to hair follicles, but I'm curious about the evolutionary explanation.

Why did humans retain this response even though we don't have thick body fur like many other mammals?

Is it simply an evolutionary leftover, or does it still serve some biological purpose?