system
Given the following post, respond as if you're commenting on Reddit:
human
How did cavemen deal with toenails?

Did theirs stop growing after a certain point? If so, why did we evolve ever-growing nails? Did they trim them somehow?
gpt
Other living primates have nails and they generally wear down. We have a special situation where we go around protecting our feet inside socks and shoes. But other primates don't do this and so their toes are exposed to many abrasives (grass, bark, rocks, dirt etc.) that keep their nails from becoming excessively long.