Why do humans smile?

Question

Why do humans smile?

Answer 1

i smile because I'm either happy or something funny happened..

=)

Answer 2

It is a natural reaction. When someone is happy or maybe it is an evil grin. Or if someone is sad they smile to convince people that they aren't upset or cheer someone else up.  

Answer 3

it is a way for people to show they are happy :D

Answer 4

Because we have the muscles that allow us to.  So do Gibbons.

Answer 5

its a way to communicate without speaking. it is body language.

why do cats wag their tails..... same thing really....except we smile when we are happy

Answer 6

Because something is funny or makes them happy,or maybe to make others feel at ease.

Answer 7

It's a natural thing, even little babies smile.  It's just a human thing.  

Answer 8

Why do humans ask questions?

Answer 9

G-It's our code for non-threatening intent. The next question is why do we lie about the intent so often?

Answer 10

All primates, including humans, use their facial features and muscles to generate expressions. Our own perception tends to label facial expressions as outward manifestations of an emotive state; a smile shows happiness. Like many kinds of behaviour, facial expressions help to regulate social relationships. At this level, the smile (or its simian equivalent) is a display that disarms aggression and eases social interactions."

Answer 11

It comes in natural, when we're happy or supprised our body just has a way of showing it.

Answer 12

To make everyone wonder what they're up to, of course :)