system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: how does the moon gravity only affect tidal forces and not anything in the land?
gpt
It does affect the things on the land, but water is a more fluid substance than rocks and people, so it is capable of being pulled up higher than something more rigid.

This is because the moon isn't lifting the whole ocean. It is lifting a whole bunch of water molecules, which drags in more of them up. This creates a change in the pressure which rises the water level a bit, and lowers it where the moon's gravity is not affecting.

But land is stiff and bones are rigid, so when it tries to pull on stuff that is not as liquid as water, there is not as pronounced of an effect on the body.