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You wrote, "There's a chance the human brain could get smaller, as a way to conserve energy - bringing us back towards the size of the noggins of our Neanderthal ancestors."

If current human brains increased in size then perhaps our brain volume would equal that of the larger brained Homo Neandertalis. Wheather that would increase our brain power is up for argument. Perhaps as with Homo Florensis, a bigger brain is not necessary for intelligence?