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@Zero
Well, yeah, you're right. Water is heavy. Moving water using nanomachines, although not actually prohibited by physics, require a lot of energy (enough to power a damn city). I always get annoyed when fiction handwaves something with nanomachines. They aren't actually as awesome as fiction likes to depict.
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“The evil that is in the world almost always comes from ignorance, and good intentions may do as much harm as malevolence if they lack understanding.” ― Albert Camus
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