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Why Do We Smile?

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Many species show off their teeth as a threat, so where did humans get our friendly smiles?

Hosted by: Hank Green

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Sources:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4812820/
https://wolf.org/wolf-info/basic-wolf-info/biology-and-behavior/communication
https://www.semanticscholar.org/paper/Smiles-when-sharing-Mehu-Grammer/87014648ba7aeb73a5343527e056334d2c0254be
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.437507
http://users.ox.ac.uk/~kgroup/publications/pdf/scharlemann_etal_2001_jeconpsy_smile.pdf
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