EditorialHigh-temperature superconductor tape, which is wound around a bottle that is used to contain a fusion reaction, at Commonwealth Fusion Systems in Cambridge, Mass., June 25, 2021. (Tony Luong/The New York Times)
EditorialHigh-temperature superconductor tape, which is wound around a bottle that is used to contain a fusion reaction, at Commonwealth Fusion Systems in Cambridge, Mass., June 25, 2021. (Tony Luong/The New York Times)