A smile is a smile or is it-?

Factual Questions
1

A smile is a smile

When a wolf shows his teeth,.,./,./.,.,

.,.,.,…,.He means business

When we humans show our teeth it’s called a smile

Is the difference an evolutionary thing and once upon a time we smiled for the same reason wolves smile today-?

is a smile universal-? Just asking (:-

Dada smile:

http://tinyurl.com/kpsv7cj

Now this IS a smile—

http://tinyurl.com/p2pzhs3

What are you smiling about-?

2

Your earlier thread here had an identical OP. It’s still not suitable for General Questions.

3

Moderator Action

This post is identical to the OP of this thread, which was moved to MPSIMS: what are you smiling about-? - Miscellaneous and Personal Stuff I Must Share - Straight Dope Message Board

Since this is not a factual question, this copy is closed.