A nuclear reactor in the U.K. has just broken a new fusion record.
In a news conference today (Feb. 8), representatives from the Joint European Torus (JET) facility declared that the reactor's final tests yielded 69.26 megajoules of heat from just 0.21 milligrams of fuel — the equivalent of burning 4.4 pounds (2 kilograms) of coal. This is more total energy — though not more net positive energy — than any other fusion reaction has produced thus far.
