In April, Jeff Bezos's Project Prometheus closed a $10 billion funding round at a $38 billion valuation. While just five months old at the time, and with no products shipped and no research published, its investors included some of the most prominent in the world, including JPMorgan and BlackRock.But more attractive to investors that current sales was the bet Prometheus is making: building AI systems that simulate the behavior of materials, machines, and physical processes, a burgeoning category known as physical AI.Prometheus is not alone in this race. That same month, SoftBank filed to IPO a robotics and AI company…