We're just in a brief pause in our evolution from apes.

If a rogue sun-flare or nuclear crazies don't get us first then those mutants in our evolutionary process are sent off-planet to colonize newly found places. While they thrive, the 'normal' people eventually deteriate and start to de-evolve. Or was that a Heinlein novel?....
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"Nothing in life is so exhilarating as to be shot at without result."-Churchill