天天学习
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  • 1
  • 女承父业
  • 2010-09-03
  • Over the past 50 years more and more women have entered the work force. And they’re increasingly taking on jobs that have traditionally gone to men. 在过去50年来，越来越多的妇女进入了劳动力大军。而且从事原来由男子从事的工作的人数也在增加。 Now new research shows that the women’s fathers may be having an influence on what those jobs are. 现在新的研究表明，女性的父亲可能会影响她所从事的工作。
  • 2
  • 金子的诱惑
  • 2010-09-03
  • The lure of gold can be electric to some people even though the element is chemically inert on the large scale. But the researchers from Georgia Tech report that down at the level of atoms, gold can conduct electricity and act as an insulator as well.
  • 3
  • 无线网络易成病毒攻击对象
  • 2010-09-03
  • We’ve all gotten e-mails warning us about nasty computer viruses. Maybe you even have antivirus software installed on your machine. Well, now scientists say that our wireless networks are particularly vulnerable to infection, especially in densely populated urban areas. 我们都得到过电子邮件告诫有讨厌的计算机病毒。可能在你的机器上还安装了防毒软件。那么，现在科学家们说，我们的无线网络更容易受到感染，特别是人口密集的城市地区。
  • 5
  • 演讲流传千古但抵触布什
  • 2010-09-03
  • WASHINGTON — Though couched in indirect terms, Barack Obama’s inaugural address was a stark repudiation of the era of George W. Bush and a vow to drive the United States into “a new age” by reclaiming the values of an older one.
  • 6
  • 进行中的宇宙航行
  • 2010-09-03
  • As Kepler showed, the Earth’s orbit is an ellipse(椭圆形), with the sun at one of the two focal points. He also figured out the planet goes faster when it’s at perihelion(近日点), nearer the sun, than when it’s at aphelion (远日点), its farthest distance—which would explain why summer seems to zip by, except the seasons are a function of the tilt (倾斜) of the Earth’s axis, not its different distances from the sun. And the Earth rotated 365 and a quarter times during its sweep around the sun. The trip took 8,766 hours. Or 31,557,600 seconds. Or 525,960 minutes just like this one.
  • 7
  • 摄像机抓住闯红灯的司机
  • 2010-09-03
  • Cameras that catch drivers who blow through red lights are there to improve safety by discouraging light-running. But such cameras actually increase the likelihood of car crashes.
  • 8
  • 夏时制: 在黑暗中醒来
  • 2010-09-03
  • Light is what preps us for waking, alerting the brain to increase body temperature and cortisol, and decrease melatonin. When we’re forced to wake in darkness, we feel like it’s the middle of the night, and from our body’s perspective it is, and we’re tired. 晨曦为我们醒来做好准备，提醒大脑增加体温和皮质醇，降低褪黑激素。当我们被迫在黑暗中醒来，我们会觉得这是半夜，从我们身体的角度来看，表示我们很疲惫。
  • 9
  • 古老的能源主力:木材
  • 2010-09-03
  • On March 11th, Interior Secretary Ken Salazar called for a “moonshot for energy independence.” He’s set up a task force to look into the large-scale production of solar, wind and geothermal energies. But he didn’t say anything about wood. That’s right: Wood. In the March 13th issue of Science, researchers in the U.S. and in Austria tout wood as a neglected but potentially useful source of energy. 3月11日，内政部长 Ken Salazar 呼吁“能源独立的壮举”。他成立了一个任务小组，探讨大规模生产太阳能、风能以及地热能源。但他没有说与木头相关的东西。没错：木头。在3月13日的科学杂志上，美国和奥地利的研究人员宣扬木头虽然被忽视，但可以作为潜在的能量来源。
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