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(单词翻译:双击或拖选)
Neandertal Face Shape Was All Over the Air
The jutting1 midface of Neandertals seems to have evolved to help get large volumes of air into an active body that needed lots of oxygen.
Full Transcript2
Neandertal walks into a bar. Bartender says, “Why the long, forward-projecting face?” Well, according to a new study, it helped the Neandertal air-condition the large volumes of oxygen he inhaled3 to support his active lifestyle. The work appears in the Proceedings4 of the Royal Society B. The bartender appears in many, many jokes. [Stephen Wroe et al., Computer simulations show that Neanderthal facial morphology represents adaptation to cold and high energy demands, but not heavy biting]
Neandertals had a distinct facial appearance: heavy brows, big noses and a protruding5 upper jaw6. And scientists have long wondered why that configuration7. The foreheads, it appears, they inherited from their ancestors. But the jutting midface—that was an evolutionary8 innovation all their own.
Some scientists say it’s so they could use those prominent front teeth for some serious chomping9. Others say it gave their nasal passages the right size and shape to warm and moisten the cold, dry, Ice Age air.
To put the theories to the test, researchers constructed a set of 3-D simulations of the skulls10 of various humans. They included a Neandertal and an earlier Homo heidelbergensis as well as a handful of more modern noggins: males and females from Europe and Asia and an Arctic Inuit. And they digitally crash-tested the faces to see how they responded to the loads imposed by heavy biting.
Seems the protruding choppers of the Neandertal were not particularly well suited to forceful mastication11. Some of the modern humans seemed to be more efficient when it comes to using less muscle to take a big bite.
Then the researchers modeled how air flowed through Neandertal nasal passages. And that’s when things got interesting. The results indicate that Neandertals were better at heating and humidifying air than H. heidelbergensis. But so are us modern peoples—whether we hail from cold or hot climates.
Where Neandertals really stood out was in their ability to move large volumes of air through their nasal passages in and out of their lungs. That’s a plus when you spend your days running down mastodons. Or running from other critters whose teeth are better adapted for biting action than yours are.
So if the bartender is still listening, that's why the distinctive12 Neandertal face.
—Karen Hopkin
[The above text is a transcript of this podcast.]
1 jutting | |
v.(使)突出( jut的现在分词 );伸出;(从…)突出;高出 | |
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2 transcript | |
n.抄本,誊本,副本,肄业证书 | |
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3 inhaled | |
v.吸入( inhale的过去式和过去分词 ) | |
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4 proceedings | |
n.进程,过程,议程;诉讼(程序);公报 | |
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5 protruding | |
v.(使某物)伸出,(使某物)突出( protrude的现在分词 );凸 | |
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6 jaw | |
n.颚,颌,说教,流言蜚语;v.喋喋不休,教训 | |
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7 configuration | |
n.结构,布局,形态,(计算机)配置 | |
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8 evolutionary | |
adj.进化的;演化的,演变的;[生]进化论的 | |
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9 chomping | |
v.切齿,格格地咬牙,咬响牙齿( chomp的现在分词 ) | |
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10 skulls | |
颅骨( skull的名词复数 ); 脑袋; 脑子; 脑瓜 | |
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11 mastication | |
n.咀嚼 | |
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12 distinctive | |
adj.特别的,有特色的,与众不同的 | |
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