Reality is the most expensive place to run an experiment. Prajit is building Sapiaverse, a digital twin of billions of AI agents that models what populations actually do—not what they say—so leaders can test plans, prices and policies before committing capital. National Science Olympiad gold at 17, a patented five-second tuberculosis breath test at 20 and nine NeurIPS and MICCAI papers by 23: he is now turning that research horsepower into a population time machine.