system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does the skin under your nails let the nail move and grow while holding it on?
gpt
Nails don’t grow “out” like one would think.  They actually “roll” forward...think like waves on the beach.  The skin that is attached (the nail bed) this doesn’t need to move; it stays attached to the new nail that grows over it.