Actual advances in fusion and related energy generation tech. For example, at least one startup, Helion, is developing a way to generate electricity directly from the fusion reaction and magnetic field, instead of indirectly by heating water into steam that then turns a turbine generator. The increased efficiency from that might enable it produce net electricity. And quite frankly, it's way past time that we advanced beyond converting energy -> heat -> motion -> electricity, and shortened that cycle to energy -> electricity.