FILE - In this Feb. 1, 2011 file photo, chimpanzees sit in an enclosure at the Chimpanzee Eden rehabilitation center, near Nelspruit, South Africa. A study of chimps and orangutans released on Monday, Nov. 19, 2012, finds the same pattern of changes in happiness through life as many studies find in people. (AP Photo/Erin Conway-Smith, File)
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