In paleontology, bones may steal the show. But to comparative biologist Armita Manafzadeh, joints are where the action is. As she sees it, almost every animal with a backbone that has ever walked, flown, swum or slithered across the planet has done so because of joints. It’s an understudied part of the evolutionary puzzle. Manafzadeh, soon to set up her own lab at the Georgia Institute of Technology, started her joint research in pterodactyls, which are often depicted as flying like bats, with..