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Casts of human skulls(Courtesy Roger Seymour/University of Adelaide/South Australian Museum)
Brain size has traditionally been seen as the best way of comparing the intelligence levels of human ancestors. Now a team of researchers believes it has found a more accurate gauge: cerebral metabolic rate, or the amount of energy consumed by the cerebrum, which can be estimated based on the amount of blood delivered to it. As a proxy for cerebral blood flow, they measured the size of openings in the
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