What is a smile?

Related questions

1. How does Smiling change your brain?
2. What it means to smile?
3. What does it mean when someone smiles a lot?
4. Why is yawning contagious?
5. Can you fake a genuine smile?
6. Does fake smiling make you happy?
7. Do pets make you happier?
8. What does smile mean Snapchat?
9. Can smiling make you feel happier?
10. Do white teeth make you more attractive?

Tags

1. #flexing
2. #similar
3. #pleasure
4. #sides
5. #grimace
6. #among
7. #formed
8. #humans
9. #smiling
10. #expression
11. #anxiety
12. #distinct
13. #mouth
14. #involuntary
15. #sociability
16. #amusement
17. #muscles
18. #denoting
19. #known
20. #primarily
21. #smile
22. #usually
23. #happiness