>> Hmm, I wonder... does the human brain heat up significantly when you 
>> think harder?
> 
> No, because the efficient adaptive cooling system makes sure it doesn't :-P
> 
> But yes, the human brain makes for a good deal of energy consumption in 
> the organism. And consumption does vary, so heat output will, too.

One thing a lot of people don't seem to realise is that the brain does 
*other stuff* besides thinking...

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