New research challenges the long-held idea that, because the brain of human ancestors called australopithecines was larger than that of many modern great apes, they were smarter. Forensic facial reconstruction of Australopithecus afarensis. Image credit: Cicero Moraes / CC BY-SA 3.0. University of Adelaide’s Professor Roger Seymour and colleagues measured the rate of blood flow to the cognitive part of the brain, based on the size of the holes in...