> As an aside... How much heat does the human brain generate?

You can do a quick estimation by seeing how much heat is radiated, the skin 
temperature is approximately 32 degrees, room temperature is 20 degrees, and 
the surface area of your head is, umm about 0.08m^2.  Using the 
Stefan-Boltzmann law I make that about 6W of radiated heat.  Given that the 
human body generates about 100W, I think the 6W figure is too low, as some 
of the heat from the brain will be taken into the body by the blood stream 
(liquid cooling!).  I guess around 20W would be a more sensible figure.


> (By every estimate I've seen, it has vastly superior theoretical 
> computational power compared to any supercomputer yet built by man.)

If my computer were as slow as me doing sums it would probably run on solar 
power in the dark!  And if I tried to do 3 billion sums in one second my 
head would surely explode.

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