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https://en.m.wikipedia.org/wiki/Nuclear_fusion

The fusion of light elements up to a certain nucleus size releases energy. However, fusion only occurs at very high temperatures and pressures. The goal is to 1) create the conditions for nuclear fusion (which they did), 2) have the fusion reaction produce energy that sustains those conditions (they did for 48 seconds), and ideally a tiny bit more, 3) gather residual energy that isn’t critical to the reaction itself, which is the part that looks like a steam engine.

Give https://ploum.net/2023-06-23-how-to-kill-decentralised-networks.html a read. Might sway you, might not.