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http://news.slashdot.org/story/22/06/05/1917252/fusion-energy-the-35-country-clean-energy-…

…n challenge is sustaining it. The tokamak in the UK — called the Joint European Torus, or JET — held fusion energy for five seconds , but that's simply the longest that machine will go for. Its magnets were made of copper and were built in the 1970s. Any more than five seconds un…