Haha... about trepanation... such a load of crap...
"...by cutting a hole into the skull and leaving it open permanently, you would allow a permanent increase in brain blood volume, or that the brain would adjust itself to a new equilibrium, a new 'brain blood volume to cerebro-spinal fluid' ratio. The idea is that by re-opening the skull you would allow more blood to flow to the brain, on a permanent basis, and that you would restore the brain pulsation level to that of infancy, when the skull had not yet sealed itself shut and forced much of the brain blood out of the head. The increased blood to the brain would mean more oxygen to the brain, and the theory is that it would again function at the levels of youth"
The skull (i.e. the bone) doesn't hold back the blood volume... it is just the outer shell...
There is a thing called dura mater... I took an anatomy class where we got to fuck around with body parts, and the most interesting thing was seeing how tough the dura mater was-- almost felt like some sort of synthetic material, like kevlar. It wraps right around your brain, doesn't stretch, and it keeps everything the same volume.
Ignorant dumbasses... if I saw that guy, I'd poke him real hard in the top of his head.