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SSS 2010-09-21

时间:2010-10-08 06:01来源:互联网 提供网友:xn0006   字体: [ ]
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This is Scientific American’s 60-Second Science, I’m Steve Mirsky. Got a minute?

 

There’s a cool new Web site—and iPhone app—that could come in handy in a wide variety of circumstances. It’s called Time Tree. And it tells you how closely related any two organisms are over time. In other words, it’ll tell you what the available data say is the time since any two organisms shared a common ancestor. Time Tree is jointly1 run by Penn State’s Blair Hedges and Arizona State’s Sudhir Kumar.

 

So let’s say you’re out for a walk in the woods, with your iPhone handy, and you run into a grizzly2 bear. You quickly load the app and key in the two organisms you’re interested in. Those would be you, a human, and grizzly bear, the thing that’s approaching you alarmingly fast. In just a couple of seconds, you are informed that you and the grizzly bear shared a common ancestor just 98.2 million years ago.

If you have a computer and are just curious about the grizzly bear, go to timetree.org. The results average the findings of published papers relevant to your search and include links to the papers.

Thanks for the minute, for the Scientific American’s 60-Second Science. I’m Steve Mirsky
 


点击收听单词发音收听单词发音  

1 jointly jp9zvS     
ad.联合地,共同地
参考例句:
  • Tenants are jointly and severally liable for payment of the rent. 租金由承租人共同且分别承担。
  • She owns the house jointly with her husband. 她和丈夫共同拥有这所房子。
2 grizzly c6xyZ     
adj.略为灰色的,呈灰色的;n.灰色大熊
参考例句:
  • This grizzly liked people.这只灰熊却喜欢人。
  • Grizzly bears are not generally social creatures.一般说来,灰熊不是社交型动物。
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