With car sales cratering worldwide, Tesla CEO Elon Musk has his work cut out, looking for other areas of growth. Apart from launching a fleet of autonomous "Cybercab" robotaxis, the billionaire has promised that an army of Optimus humanoid robots could soon be roaming factory floors, signaling a revolution in manufacturing. At least, that's his grandiose vision. Earlier this week, Musk told CNBC that the carmaker will have "thousands of Optimus robots working in Tesla factories by the end of this year, beginning this fall," a characteristically ambitious timeline that's likely far removed from reality. But even the company's own […]