Batteries can make the grid cheaper and cleaner—but only if they know when to store power, sell it and sit still. Yuxin is building Wattness, software that makes those decisions in real time, earning more from each battery without wearing it out too soon. She moved to Singapore alone at 15 on a national scholarship, built physics-informed cooling technology for EVs and data centres while at NUS, then walked away from a full engineering scholarship to back herself.