Frank McAndrew has heard it more times than he can count. Someone finds out he studies gossip and says, with great indignation: “I never gossip.” His first thought, every time? “You must be the most boring person in the world.” McAndrew, an evolutionary psychologist at Knox College in Illinois who’s spent decades studying the science of talking behind people’s backs , has a message for the self-appointed gossip-free among us: You’re almost certainly wrong about what gossip is, and you’re