Barring all the tech that is still either on the early experimental stage and the stuff the Deep State deliberately blocks from reaching the more mainstream academic science media, how far do you think mankind (and the U.S. in particular) is from developing functional nuclear fusion reactors ?
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40 years in industry; not anywhere near close. Temperatures required to initiate reaction are ~100 million C, about six times the temp of the sun. A multinational team have been working decades on a design that magnetically suspends the plasma in a torus shaped structure to contain the reaction (search Tokamak fusion reactor). What possibly could go wrong?
There was some premature ejaculation concerning the potential for cold fusion reaction about 20 years ago, but I believe that idea has long since shot its was and gone limp.