system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Are facial expressions genetic or do we learn them?

Do we pick them up from adults while we're young? 

Or are the muscles in our face 'programmed' to make certain expressions when we're happy, upset, angry, etc?
gpt
It's a little bit of both.

There are certain things we all instinctual just know of - Things like smiling when we're happy. Like grimacing when in pain.

Even people who are blind and have never seen another face smile, frown, grimace.

But there are definitely things we adapt to those around us as well.