[科学美国人60秒] SSS 2015-10-13

If you are lost, you need a map and a compass. The map pinpoints where you are and the compass orients you in the right direction. Migratory birds, on the other hand, can traverseentire hemispheres and end up just a couple of miles from where they br

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[科学美国人60秒] SSS 2015-10-12

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发表于:2019-01-20 / 阅读(61) / 评论(0) 分类 2015年Scientific American(十)月

[科学美国人60秒] SSS 2015-10-09

Wilder protected areas get eight billion visitors a year, and that's just on land. Underwater reserves? add a million to the tally, which, considering these are protected areas, seems like an insane number of people. It isn't insane. Dane Blumstaine,

发表于:2019-01-20 / 阅读(86) / 评论(0) 分类 2015年Scientific American(十)月

[科学美国人60秒] SSS 2015-10-08

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【科学美国人60秒】SSS 2015-10-01

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[科学美国人60秒] SSS 2015-10-05

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[科学美国人60秒] SSS 2015-10-06

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[科学美国人60秒] SSS 2015-10-07

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[科学美国人60秒] SSS 2015-10-02

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[科学美国人60秒] SSS 2015-10-20

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[科学美国人60秒] SSS 2015-10-16

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[科学美国人60秒] SSS 2015-10-15

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[科学美国人60秒] SSS 2015-10-27

This is scientific american sixty seconds science.I'm Julie Rosen, got minute. Each fall, thousands cohort samen flock to northwest river to spone. but many never get the chance especially near bit city like Seatle.and some of these urban areas'90 pe

发表于:2018-12-24 / 阅读(47) / 评论(0) 分类 2015年Scientific American(十)月

[科学美国人60秒] SSS 2015-10-29

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发表于:2018-12-24 / 阅读(61) / 评论(0) 分类 2015年Scientific American(十)月

[科学美国人60秒] SSS 2015-10-30

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[科学美国人60秒] SSS 2015-10-28

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[科学美国人60秒] SSS 2015-10-21

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[科学美国人60秒] SSS 2015-10-22

You can talk to teens all you want about sex, but if you want to drive home healthy messages about consent, maybe you should have them watch. In the criminal justice system, sexually based offences are considered especially heinous. Law In Order, spe

发表于:2018-12-24 / 阅读(59) / 评论(0) 分类 2015年Scientific American(十)月

[科学美国人60秒] SSS 2015-10-23

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发表于:2018-12-24 / 阅读(64) / 评论(0) 分类 2015年Scientific American(十)月

[科学美国人60秒] SSS 2015-10-26

Each fall thousands of Coho salmon flocked to northwest rivers to spawn, but many never get the chance, especially near big cities like Seatle. And in some of these urban areas, up to ninety percent of the female were dying before they spawned, which

发表于:2018-12-24 / 阅读(59) / 评论(0) 分类 2015年Scientific American(十)月
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