Dyson spheres are unlikely. They use too much physical matter to create. Ringworlds are slightly more likely.
Space elevators are awesome though. We should do that :)
Still waiting on the ability to grow nanotubes long enough, though... we're getting there. We can build them long enough to turn into thread - but proper long-filament nanotubes are the only thing (that we know of so far) that will be strong enough for the elevator ribbon.
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"Freedom is the freedom to say that two plus two make four. If that is granted, all else follows."
Probably my favorite statement on rationality, it's so practical for launching off into every other sphere of thought - politics, ethics, theology, maths/physics, and, well, all else that follows.