1. Meet Santino, a super-smart chimpanzee living in the Furuvik Zoo in Sweden who has received a lot of attention lately for his learned ability to outsmart his human spectators.

    One day in 2010, Santino was apparently fed up with being ogled, so he scared visitors away by aggressively flinging stones. (No one was hit.) Later that same day, when a different group of people approached his pen, the chimp came up with a new idea. "Santino approached them holding two stones, but this time appearing nonaggressive and munching on an apple." When he got close enough, the sly primate let the rocks fly, taking the humans by surprise. 

    In a new study published in the journal PLoS One, researchers suggest that the chimp’s deceptions hint at a deep level of thinking once only associated with humans