system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does the hair on our head grow so much faster than other parts of our body?

Today is also my bday!
gpt
Humorously enough, someone just recently asked why the hair on the head grows so much slower than on the rest of the body. 

In actuality, it all grows at about the same speed. The hair on your head gets *longer* because the cycle at which hairs are shed and replaced with new hairs is longer, and therefore they aren't shed as often and can achieve a greater overall length.  That might make it *seem* like it grows faster, since the hair on your body 'appears' to be staying the same length while it is growing on your head. But it's just that it is being replaced more often on your body.