Kiki is a chimpanzee at Tchimpounga Chimpanzee Sanctuary in the Republic of Congo. A new study of chimpanzees and bonobos finds that humans aren’t the only species susceptible to “glass half empty" thinking. Photo by Alexandra Rosati, Duke University.

Apes Prefer the Glass Half Full

[caption id="attachment_2700" align="alignright" width="250"] Kiki is a chimpanzee at Tchimpounga Chimpanzee Sanctuary in the Republic of Congo. A new study of chimpanzees and bonobos finds that humans aren’t the only species susceptible to “glass half…