Flywheels had their moment in the hybrid racing world, but rapid advancements in the cost and durability of batteries quickly spun them into irrelevance.

Department of Chemistry, Durham University, Lower Mount Joy, South Road, Durham DH1 3LE, U.K.

Researchers cracked a 70-year-old fusion problem, allowing faster, more accurate reactor designs that could finally make fusion energy viable. Credit: SciTechDaily.com Scientists have developed a ...