Tesla CEO Elon Musk predicts that by 2040 there will be more humanoid robots than people globally.Musk believes that the Optimus robot, developed by Tesla, will play a significant role in this future.He stated that Optimus will cost less than $30,000 and expects it to be the most popular product in any industry.The Optimus robot is part of Tesla's AI project and is designed to perform various tasks, including childcare and dog walking.