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what is the meaning behind the happy face symbol?

is it like sun worshiping, or solar disk, this matter is really important so i can figure something else out, thanks if you know.

Public Comments

1. Have a Happy Day! http://en.wikipedia.org/wiki/Smiley http://www.straightdope.com/columns/read/961/who-invented-the-smiley-face http://www.answers.com/topic/smiley
2. Go rent the movie Forrest Gump. All shall be revealled.