1) Not sure - humans spent quite a while not building technological civilizations. 
2) Yes, this seems to be true, although I&#x27;ve wondered why there are less adaptations wrt getting more through less; is a sphere the optimal configuration for a brain case - other animals seem to have done other things, humans haven&#x27;t which is strange. 
3) Well - arguable, the measurements are difficult as if you manage to deprive other bits of the system of power the brain stops working.
4) One wonders how many kids in rural where-ever-when-ever could have done the same if they had lucked out?