NOTES
Chapter 1
1. Ron Gutman, Smile: The Astonishing Powers of a Simple Act (New York: TED Books, 2011), Kindle Edition, p. 448.
2. Elaine N. Marieb and Katja Hoehn, Human Anatomy & Physiology, 9th ed. (Boston: Pearson, 2013), e-book, p. 599.
3. British Dental Health Foundation, “Yet Another Reason to Look After Your Teeth!,” http://www.dentalhealth.org/news/details/209, accessed November 16, 2013.
4. Paul Ekman, Richard J. Davidson, and Wallace V. Friesen, “The Duchenne Smile: Emotional Expression and Brain Physiology II,” Journal of Personality and Social Psychology 58, no. 2 (1990), pp. 342–353.
5. Tom Scheve, “How Many Muscles Does It Take to Smile?,” How Stuff Works, http://science.howstuffworks.com/life/muscles-smile.htm, accessed ...
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