Americans' heads have gotten even bigger (literally)

Is your hat feeling a little too snug? New forensic research has found the skulls of white Americans born between 1825 and 1985 have on average increased in size by about a third of an inch, and this could also be true for other races and nationalities. The growth equates to about a tennis ball's worth of additional space up there. Unfortunately, University of Tennessee biological anthropologist Richard Jantz doesn't say it means we're smarter. "Other research shows a bigger cranium doesn't necessarily mean more intellect," he said. So why are Americans having to reach further to scratch their heads? No-one knows for sure. Maybe if had become smarter, we would.