User blog comment:ChrisL123/Smarter or tribal?/@comment-4206034-20110729095054

I agree. It depends on how much OF their brain could they use rather then how big their brain is. For all we know, they could have had a smaller brain but their brain might be able to do more functions then their larger brain could. It really depends on how much you could use your brain. It is known that geniuses like Einstein used more of their brains than an average human.