Just as European scientists here gear up to put decades of experiments to the test and try to bottle up the nuclear reaction that powers every star in the universe, Brexit is throwing the future of their work into doubt.

The 34-year-old Joint European Torus (JET), which sits in the Culham Centre for Fusion Energy’s retro 1960s laboratory, is a crucial part of an international research push on nuclear fusion that hopes to, one day, fuel homes and cities with energy free of greenhouse gases and waste. Continue reading.