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Why assume levitation is mental? ...if its even possible at all. The energy must come from somewhere, and so far we have not found anything remotely linked to being able to levitate that would be tied to the human body. Of course we know very little and could easily discover something in the future. For all we know though we may find some biological way to levitate.
If we're speaking specifically of evolution as we know it and not using the word in a more colloquial way then we'd need a pressure...an adversity to evolve the need for levitation or something like it. Something in our environment would need to drastically change to make levitation key to survival.
Hopefully though we'll go all mad scientist and develop powers on our own and create our own artificial evolutionary pressures...Cause evolution as we know it takes a long, loooong time.
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