require huge energies, construction and materials that can’t and don’t exist.
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You must know all the possible materials that can exist in the Universe, in which case you must know everything also.
Carbon composite is an example of a material everyone, like you, would have said “that can’t and don’t exist” before the 20th century.
of course not, but none of that matters. It will still need a near infinite power source to create any of it.