Dancing with a partner is a common treatment for patients with Parkinson’s. Holding onto another human’s arms and moving with them improves balance, mobility, autonomy, and mood. Partners aren’t always easy to find, so the scientists looked for the obvious solution: What if instead people could dance with robots? Using an existing robot named Cody, they had 10 expert dancers do a very simple dance. Holding onto the robot’s arms, the blindfolded dancers would step back, and then forward, to the beat of a drum. Cody would follow, with a minimum of lag time.