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科学美国人60秒:尼安德特人脸型独特

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This is Scientific American — 60-Second Science. I'm Karen Hopkin.
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 inhaled to support his active lifestyle. The work appears in the Proceedings of the Royal Society B. The bartender appears in many, many jokes.
Neandertals had a distinct facial appearance: heavy brows, big noses and a protruding upper jaw. And scientists have long wondered why that configuration. The foreheads, it appears, they inherited from their ancestors. But the jutting midface—that was an evolutionary innovation all their own.
Some scientists say it's so they could use those prominent front teeth for some serious chomping. 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 skulls 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.

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尼安德特人.jpg
Seems the protruding choppers of the Neandertal were not particularly well suited to forceful mastication. 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 distinctive Neandertal face.
Thanks for listening for Scientific American — 60-Second Science. I'm Karen Hopkin.

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重点单词   查看全部解释    
configuration [kən.figju'reiʃən]

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n. 结构,布局,形态,格式塔心理完形 [计算机] 配置

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appearance [ə'piərəns]

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n. 外表,外貌,出现,出场,露面

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environment [in'vaiərənmənt]

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n. 环境,外界

 
efficient [i'fiʃənt]

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adj. 效率高的,胜任的

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innovation [.inəu'veiʃən]

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n. 创新,革新

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distinctive [di'stiŋktiv]

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adj. 独特的

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distinct [dis'tiŋkt]

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adj. 独特的,不同的,明显的,清楚的

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prominent ['prɔminənt]

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adj. 杰出的,显著的,突出的

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forceful ['fɔ:sfəl]

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adj. 有力的,强烈的

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constructed

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vt. 构造,建造;创立,构筑;搭建(construct

 

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