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Correction: Clarification

The Original Article was published on 23 July 2014

The graphic in the News Feature ‘The fusion upstarts’ ( Nature 511, 398–400; 2014) omitted to note that the deuterium–deuterium reaction has a 50% chance of producing tritium and a proton.

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The online version of the original article can be found at 10.1038/511398a

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Correction: Clarification. Nature 513, 472 (2014).

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