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I think that humans have come to a stalemate with evolution. Survival of the fittest no longer applies, since we have achieved a level where even the weakest, dumbest, fattest, and most useless of us will not only survive, but also breed. That being said, bio-engineering seems the most plausible route of future human evolution.
Now FIGHT!
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This.
Also, physical evolution may have stagnated but cultural and memetic evolution has accelerated.