The secretive, billionaire-backed plans to harness fusion

Inside a laboratory near Vancouver in British Columbia, an alarm is blaring. In the middle of the industrial warehouse stands what looks like a cannon from a spaceship, about five metres long and festooned in wires. None of the lab's red-coat-wearing technicians seem fazed by the noise. The siren, which alerts workers to don protective earmuffs in case of a blown fuse, precedes every test “shot” on this prototype nuclear fusion reactor – and these engineers...
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