American heads are getting bigger reports Health Day News. Since the 19th century skull size grew by the size of a tennis ball.

Are heads getting bigger because of evolution or lifestyle changes? "It likely results from modified growth patterns because of better nutrition, lower infant and maternal mortality, less physical work and a breakdown of former ethnic barriers to marriage," Jantz said. "Which of these is paramount we do not know."
Big Heads
Unfortuantely no one really knows why heads are getting bigger, but for us that is a good sign. We continue to make hats bigger as heads grow. 

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