Electric vehicles have transitioned from niche market items to top-selling cars globally, thanks to advancements in battery technology offering long ranges and fast charging times. However, electric planes still face hurdles due to battery weight and limited range. Professor Yet-Ming Chiang of MIT proposes using liquid metal sodium in fuel cells, reacting with oxygen for power, potentially revolutionizing aviation. The system aims for 1,000 wh/kg, surpassing current EV batteries. The exhaust, NaO2, would bond with CO2, offsetting carbon emissions. This innovation could combat ocean acidification and acid rain. A spin-off company, Propel Aero, is working on scaling the technology for commercial air travel. While further testing is required, the concept shows promise in transforming aviation and reducing environmental impact.