The joke's on us: laughter, humor, and mischief -- A generous nature: reciprocity and cooperation -- Fair and square: playing by the rules -- Stand by me: friendship -- For the fun of it: play and imagination -- Random acts of kindness: empathy and altruism -- A sense of the sacred: death and spirituality -- to know thyself: awareness and identity -- If we could talk to the animals: language -- Count them in: numerical cognition -- Technology across the kingdom: tool use -- Finding their way: spatial intelligence -- For art's sake: creativity and aesthetics -- Re-imagining IQ: thinking outside the human brain