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SSS 2011-04-21

时间:2011-05-12 05:30来源:互联网 提供网友:wp661375   字体: [ ]
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    (单词翻译:双击或拖选)

This is Scientific American’s 60-Second Science. I’m Karen Hopkin. This will just take a minute.

When it comes to handedness, righties rule. And according to a new study, they have for a long time, because even half a million years ago, nine out of 10 European humans favored their right hands. The finding appears in the journal Laterality.

Scientists have long wondered where our handedness comes from. All other tool-using primates1 show no distinct hand preference when it comes to holding the stick or stone.

But have humans always been so heavily right-handed? Some scientists had previously2 detected a right-hand bias3 when they looked at the flaking4 patterns on ancient stone tools.

In this study, researchers turned to the teeth for answers. They analyzed5 the scratches accidentally left by stone tools on teeth from human fossils collected from a half-million-year-old site in northern Spain and later sites throughout Europe. These asymmetrical6 marks showed that 93 percent of the individuals sampled tended to stuff things in their mouths from the right-hand side.

Handedness reflects our brain’s bilateral7 organization, which goes hand-in-hand with our proficiency8 with language. So our hand preference, and our penchant9 for speech, may extend deep into our evolutionary10 past.

Thanks for the minute. For Scientific American’s 60-Second Science, I’m Karen Hopkin.


点击收听单词发音收听单词发音  

1 primates 9536f12c27d026e37c108bd6fc53dbba     
primate的复数
参考例句:
  • Primates are alert, inquisitive animals. 灵长目动物是机灵、好奇的动物。
  • Consciousness or cerebration has been said to have emerged in the evolution of higher primates. 据说意识或思考在较高级灵长类的进化中已出现。
2 previously bkzzzC     
adv.以前,先前(地)
参考例句:
  • The bicycle tyre blew out at a previously damaged point.自行车胎在以前损坏过的地方又爆开了。
  • Let me digress for a moment and explain what had happened previously.让我岔开一会儿,解释原先发生了什么。
3 bias 0QByQ     
n.偏见,偏心,偏袒;vt.使有偏见
参考例句:
  • They are accusing the teacher of political bias in his marking.他们在指控那名教师打分数有政治偏见。
  • He had a bias toward the plan.他对这项计划有偏见。
4 flaking a682d1b1030727ea5bda416e41040cba     
刨成片,压成片; 盘网
参考例句:
  • He received ointment for his flaking skin. 医生给他开了治疗脱皮的软膏。
  • The paint was flaking off the walls. 油漆从墙上剥落下来。
5 analyzed 483f1acae53789fbee273a644fdcda80     
v.分析( analyze的过去式和过去分词 );分解;解释;对…进行心理分析
参考例句:
  • The doctors analyzed the blood sample for anemia. 医生们分析了贫血的血样。 来自《简明英汉词典》
  • The young man did not analyze the process of his captivation and enrapturement, for love to him was a mystery and could not be analyzed. 这年轻人没有分析自己蛊惑著迷的过程,因为对他来说,爱是个不可分析的迷。 来自《简明英汉词典》
6 asymmetrical gO7ye     
adj.不均匀的,不对称的
参考例句:
  • Most people's faces are asymmetrical.多数人的脸并不对称。
  • Folds may be gentle and symmetrical,or sharp and asymmetrical.褶皱可以是平缓而对称的,也可以是陡峭而非对称的。
7 bilateral dQGyW     
adj.双方的,两边的,两侧的
参考例句:
  • They have been negotiating a bilateral trade deal.他们一直在商谈一项双边贸易协定。
  • There was a wide gap between the views of the two statesmen on the bilateral cooperation.对双方合作的问题,两位政治家各自所持的看法差距甚大。
8 proficiency m1LzU     
n.精通,熟练,精练
参考例句:
  • He plied his trade and gained proficiency in it.他勤习手艺,技术渐渐达到了十分娴熟的地步。
  • How do you think of your proficiency in written and spoken English?你认为你的书面英语和口语熟练程度如何?
9 penchant X3Nzi     
n.爱好,嗜好;(强烈的)倾向
参考例句:
  • She has a penchant for Indian food.她爱吃印度食物。
  • He had a penchant for playing jokes on people.他喜欢拿人开玩笑。
10 evolutionary Ctqz7m     
adj.进化的;演化的,演变的;[生]进化论的
参考例句:
  • Life has its own evolutionary process.生命有其自身的进化过程。
  • These are fascinating questions to be resolved by the evolutionary studies of plants.这些十分吸引人的问题将在研究植物进化过程中得以解决。
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