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There are many fusion reactors, just none that produce more energy than they consume.

Barring some random research breakthrough by a small team somewhere, ITER is probably the best bet for reaching positive net energy first: https://en.m.wikipedia.org/wiki/ITER

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Yeah, in fact many folks have created DIY fusors in their garages. Just hook any sort of energy harnessing device onto that and you can claim you've got a fusion reactor too!

https://makezine.com/projects/make-36-boards/nuclear-fusor/

Indeed. I believe the smallest — most hobbyist fusors — are about the size of a suitcase.

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