Tesla ($TSLA@US) unveiled its robot prototype, Optimus, at its artificial intelligence event on Friday. Optimus introduced itself to the crowd by taking a few steps, waving, and performing some basic dance moves. “Our goal is to make a useful humanoid robot as quickly as possible,” he said, with the aspiration of being able to make them at high volume and low cost. “It is expected to cost much less than a car,” he said.