The robot, dubbed Optimus by Tesla, walked stiffly on stage at Tesla’s AI Day, slowly waved at the crowed and gestured with its hands for roughly one minute.Robotics developers often use tethers to support robots because they aren’t capable enough to walk without falling and damaging themselves.Boston Dynamics robots have been seen doing back flips and performing sophisticated dance routines without a tether.“We just didn’t want it to fall on its face.”Tesla also showed videos of its robot performing simple tasks like carrying boxes and watering plants with a watering can.The robot displayed Friday, despite its limitations compared to competitors, was significantly ahead of what Tesla revealed a year ago, when a person jumped on stage in a robot suit and danced around."