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This December 10, 2015 file photo shows the nuclear fusion research center at the Max Planck Institute for Plasma Physics where the first plasma has been produced at the “Wendelstein 7-X” in Greifswald, Germany. Scientists are poised to flip the switch on an experiment that could take them a step closer to the goal of generating clean and cheap nuclear power. Researchers at the institute plan to inject hydrogen into a doughnut-shaped device to produce a super-hot gas known as plasma. A test on Wednesday, Feb. 3, 2016, will show whether the 400-million-euro (US $ 435-million) device can handle hydrogen, which would be the fuel in future fusion reactors. (Photo by Stefan Sauer/DPA via AP Photo)
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