One of the challenges of aneutronic fusion is the fact that it uses a Hydrogen-Boron reaction for fuel, rather than the more traditional deuterium-tritium fusion reaction.

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Another possibility--the most disturbing one, actually--is that the North Koreans had been telling the truth when on May 12, just two days before South Korea detected the high levels of xenon, they announced they had created a nuclear fusion reaction, a step necessary to the building of a thermonuclear device.

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"You can log in, see the play and see people's reaction to it, " said Mark Duffy, 3D manager of Fusion Unity, the company that has masterminded the virtual link up.

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In fact his trick (and the reason why it might be possible to produce a nuclear reaction in such a small piece of apparatus) is that what he does propose is not really fusion at all.

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Unlike the sort of fusion done in big machines, which squeeze heavy hydrogen nuclei together, no neutrons are released in this reaction.

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