If you want to survive the robot apocalypse\u2014the nerd joke goes\u2014just close the door. For all that they\u2019re great at (precision, speed, consistency), robots still suck at manipulating door handles, among other basic tasks. Part of the problem is that they have to navigate a world built for humans, designed for hands like ours. And those are among the most complex mechanical structures in nature. Relief for the machines, though, is in sight.