system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 Why are some areas of the human body hairier than other areas?
gpt
Mainly heat retention. You lose the most heat through your head, arm pits, and groin. Hair retains that heat and that’s important bc it takes a lot of calories to keep us warm in a cold environment. Additionally, you usually have more hair on the front of your legs/arms bc those face into the wind while on the move. Hair can also serve as tactile perception for when a bug is crawling on you or goosebumps occur. Hair around the eyes keeps dust and sweat out.