Apes prefer the glass half full. Duke Today, Feb. 11, 2015. Humans aren’t the only species to be influenced by spin. Our closest primate relatives are susceptible, too. For example, people rate a burger as more tasty when it is described as “75 percent lean” than when it is described as “25 percent fat,” even though that’s the same thing. A Duke University study finds that positive and negative framing make a big difference for chimpanzees and bonobos too. Picked up by the Daily Mail and Scientific American.