system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do we feel a sense of coolness when something is really hot?
gpt
The nerves they sense cool are different and shallower than the nerves that sense heat.

All nerves can be stimulated by things other than there intended use-- rub your eyes and the changing pressure will make you see colors.

The shallower cool nerves are stimulated by the heat, and you feel a cool feeling before the deeper hot nerves get stimulated.