A star on Earth. For 70 years now, nuclear fusion has carried a running joke: it's still 30 years away. But finally—for real this time! we mean it!—the joke is getting old. Tokamak reactors around the world are holding superheated plasma longer than ever, new materials labs are tackling the brutal conditions inside future reactors, and the massive ITER project in France is slowly assembling what may become humanity's first true star machine. After decades of fits and false starts, the dream of near-limitless fusion power is starting to look more and more like a reality.
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