3He fusion is easy—you can do it in a garage with some hacked-together equipment. However, 3He fusion with net power output is exceptionally hard, even with co

3He fusion is easy—you can do it in a garage with some hacked-together equipment. However, 3He fusion with net power output is exceptionally hard, even with complete disregard to cost. Much harder than deuterium-tritium fusion. We don't know how to do it yet.