Iter, a reactor in France, may deliver fusion power as early as 2045

PROVENCE, IN south-east France, is known for its pleasant weather, ratatouille and thickly wooded mountainsides. But it is also the site of what will be, if and when finished, one of the most complicated machines ever built. Iter (originally, "International Thermonuclear Experimental Reactor", but now rebranded as Latin, thus meaning "journey", "path" or "method") will be a giant fusion reactor of a type called a tokamak. It will have over 1m components. Its main vessel will weigh more than 23,0...