I worked on the tokamak plasma fusion reactor at princeton plasma physics lab a while back. And by that I mean I essentially just welded railings on the scaffolding around it. ? But it was still cool to work there. It's a great theoretical power source but I still don't believe they've crossed the threshold of actually getting more power out of it than it takes to run it. But if I were putting money into a future power source that would be it. No radioactive material needed, self sustaining, essentially unlimited power, only a minor chance of setting the earth's atmosphere on fire. The only major byproduct is helium which is harmless and fun at parties. I'd drive around in a car with a fusion reactor powered motor.