Sure, a robot can show how it's feeling (insofar as a robot can feel) with its face, but that's not the only way living beings do it. Humans have their goosebumps, for instance, while cats and dogs will raise their fur. Cornell wants to bring that nuance to synthetic beings. Its researchers have crafted a robot that uses a soft, adjustable skin to provide a tactile indication of a robot's emotion -- as the university put it, you can feel its feelings. It may develop goosebumps if it's happy, spikes if it's angry, or just a timid response if it's sad and needs a hug.