America is a nation of fat - head . But hey , do n’t shoot the messenger ; we ’re just passing on the news froma recent study , which suggests that the point of white Americans are growing in book , year - on - class .
The research , carried out by forensic anthropologists at the University of Tennessee , Knoxville , examined 1,500 skull dating back as far as the mid-1800s . Over fourth dimension , it seems , the headland of white Americans have become larger in volume — but curiously , that ’s because they ’ve been getting much tall , as they ’ve also grown narrower over the menstruum .
In amount , the skull of the average male human has produce by 200 cubic centimeters . If you ’re struggling to visualise that , it ’s about the same volume as that occupied by a tennis ball . Women are n’t far behind , either , with their skulls by grown by 180 cubic centimeters . The determination were reported at the annual meeting of theAmerican Association of Physical Anthropologists .
So , ummm , why is it happen ? Actually , nobody is really sure . Richard Jantz , one of the researchers , explains that“the varieties of changes that have swept American spirit make ascertain an exact causa an endlessly complicated proposition . ”
However , there are some obvious potential explanations . First is the breakdown of former ethnic barriers to marriage , which mean that distinctive skull shapes of different races have become more dilute throughout society . 2nd is the spectacular change in nutrition over the last 200 age , which accounts for the general upward trend in human size around the world . combine , they could well have head to the juicy heads Americans now feature . [ Science Guru ]
Image byCrosly / Shutterstock
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