Americans' Heads Are Getting Bigger .doc
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1、 普特英语听力 免费学习英语更多下载 Americans Heads Are Getting Bigger美国人的头越来越大了!The story of human evolution goes something like this: Millions of years ago, homo sapiens began to evolve from the prehistoric ancestor we share with our monkey cousins. First, we evolved the ability to walk upright. Then we began fabr
2、icating more elaborate tools. Finally, around 50,000 years ago, we emerged as more or less fully modern humans with large, fully human brains. And since then, our craniums and the brains they harbor have stayed pretty much the same.Except that, according to one study, the skulls of some Americans ha
3、ve actually grown over the past 120 or so years. Specifically, skulls have become larger by about eight millimeters, or a third of an inch. Which may not sound like much, but the growth theoretically allows for additional brain matter roughly equivalent to the size of a tennis ball.Now, before we go
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