Brain power

Annapurna informed me the other day that the human brain runs on about 15W. I couldn't believe that so I looked around a bit. Seems like 15's a little bit of an underestimate, but only a little. Most sources I could find (and I will be the first to admit that I have not done a thorough investigation...I really couldn't find any super-trustworthy sources, like say NIH/NIMH/NLM) say that the brain operates on 20-40W of power. That's kind of like the lightbulb in your fridge or oven.

Now I understand why the human species is, on the whole, rather dim-witted.