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zygomaticus major muscles

  1. spnadmin

    SciTech More To A Smile Than Lips And Teeth

    More to a Smile Than Lips and Teeth By CARL ZIMMER Published: January 24, 2011 In the middle of a phone call four years ago, Paula Niedenthal began to wonder what it really means to smile. The call came from a Russian reporter, who was interviewing Dr. Niedenthal about her research on facial...
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