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Companies say they're closing in on nuclear fusion as an energy source. Will it work?

A section of aluminium coils from one of Helion's fusion machines. The company hopes its next-generation Polaris system will produce more electricity than it consumes. Geoff Brumfiel/NPR hide caption

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Geoff Brumfiel/NPR

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Companies say they're closing in on nuclear fusion as an energy source. Will it work?

For decades, government scientists have toiled away trying to make nuclear fusion work. Will commercial companies sprint to the finish?

Companies say they're closing in on nuclear fusion as an energy source. Will it work?

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