by Sheri Speede
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   1 G. S. Waters and R. S. Fouts, “Sympathetic Mouth Movements Accompanying Fine Motor Movements in Chimpanzees (Pan Troglodytes) with Implications Toward the Evolution of Language, Neurological Research 24(2) (March 2002): 174–80.
   2 BBC News, Africa, Cameroon Profile; www.bbc.co.uk/news/word-africa-13146029.
   3 Hogan M. Sherrow, Ph.D., “The Origins of Bullying,” guest blog on Scientific American, December 15, 2011.