system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How did wild humans deal with the pain of walking barefoot?
gpt
They didn't.  Their feet developed calluses, thicker and harder skin, which meant that they didn't get hurt as badly from stepping on stuff.

Your feet are only as vulnerable as they are because you protect them with shoes all the time.  There are barefoot runners even today with callus-armored feet.