system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: fingerprints through evolution?

Whats the use for fingerprints through the years and why do we have them?
gpt
No one knows.  It is known that they're incidental to embryonic development of fingers, in which your fingertips at some point are really big (fetal finger tip pads) and then shrink back down.  This growth and shrinkage causes the skin to wrinkle up like if you stretch a balloon a lot and then let it deflate it's more wrinkly.  


But we don't understand why fetal fingers do that except to create finger prints, so now we're begging the question.  There are hypotheses: ridged finger tips can fit more nerve endings, so they can sense better?  Ridged finger tips have more surface area so they can grip better?  These are ideas that people have tested and discussed but not proved.