Any action that can be captured by text—from playing a video game using written commands to running a social media account—is potentially within the purview of this type of system. —Grace HuckinsThis story is from the next print edition of MIT Technology Review, which explores power—who has it, and who wants it. These new batteries are finding a nicheLithium-ion batteries have some emerging competition: Sodium-based alternatives. Sodium is more abundant on Earth than lithium, and batteries that use the material could be cheaper in the future. —Casey CrownhartThis article is from The Spark, MIT Technology Review’s weekly climate newsletter.