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Sabina GriffithFusion powers our sun, and holds the promise of unlimited and clean energy for the future of humanity. But how real is this promise? Can it be achieved? After decades of slow progress, scientists are coming closer to answering these questions. Two huge experiments are currently being built - ITER in Cadarache, France and Wendelstein 7-X in Greifswald, Germany. A documentary follows new developments in the quest to harness the power of the sun on Earth. The German television station 3sat is showing the program at 21.30 on 23 March.