Why do humans smile?

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Tags

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  2. #humans
  3. #sometimes
  4. #actually
  5. #people
  6. #emotions
  7. #taken
  8. #smiles
  9. #smile
  10. #simply
  11. #reasons
  12. #although
  13. #contentment
  14. #social
  15. #signs
  16. #because
  17. #resignation
  18. #happy
  19. #different
  20. #complex