【Phat Yeti出品】60-SECOND SCIENCE 官方听力文稿 + 讨论帖 （更新至：2008.03.07）

深海lavenderUID: 2350207

:lol 我也觉得我很强......哈哈.

buaa_wangchaoUID: 2179665

你不会是一个一个自己编辑的吧？;d: 那样你才牛呢

firebearUID: 2288201

棒  sa从高中开始就是必看科普读物

深海lavenderUID: 2350207

哪有那么夸张...:funk: 那我不累死了,从CUUS上搞的,就删了下乱码,半分钟就好了.;d:

hahajangUID: 2383799

好东西啊，顶

buaa_wangchaoUID: 2179665

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深海lavenderUID: 2350207

兄弟,PFPF!

豆豆～UID: 2378384

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哇哈哈哈～

[ 本帖最后由 豆豆～ 于 2007-12-19 00:16 编辑 ]

buaa_wangchaoUID: 2179665

;d: 各种不同的版本！;d:

深海lavenderUID: 2350207

牛......顶下飘走.

豆豆～UID: 2378384

Moving Waters May Still Be Muddy

The last time you thought about mud might have been when you were making pies out of it.  But scientists just cleared up some muddy ideas.  It had been thought that mud forms only in still water.  But researchers writing in the December 14th issue of the journal Science report that mud still can occur when water is moving.

To sift out this conclusion the scientists got down and dirty.  They built a flume, a channel for moving water.  And they suspended fine clay particles in the liquid.  Mud of course formed when the water wasn’t moving.  But when a motorized paddle created a current, mud also formed.

Cleaning up misconceptions about mud is interesting on its own.  But the researchers say the finding should also help engineers who have to maintain harbors, shipping lanes and canals.  Because they now have the real dirt on the conditions that lead to mud.  And since mud is a big part of the geological record, we may have to re-examine ideas about the conditions that existed millions of years ago and led to the rock formations we find today.

[ 本帖最后由 豆豆～ 于 2007-12-19 09:17 编辑 ]

深海lavenderUID: 2350207

顶下.

豆豆～UID: 2378384

这次顶的真简练，哈哈

看来果然很忙。

大家加油！！～

buaa_wangchaoUID: 2179665

顶

豆豆～UID: 2378384

Meteors May Set Off Explosions of Biodiversity

If you woke up this morning and the newspaper headline screamed Meteor Headed for Earth, you’d think: That’s not good. And you’d probably be right. But sometimes a little cosmic bombardment can be just what the doctor ordered. In a study published online in the journal Nature Geoscience, researchers in Sweden say that 470 million years ago, meteor showers might have boosted our biodiversity.

The scientists were studying rocks from China and Scandinavia. And they were looking for two things. First, they were counting the number of different clam-like species they could find. Second, they were searching for chemicals that were carried here by meteorites—extraterrestrial chromite, stuff like that.

They found that a huge burst of diversification coincides exactly with a time when meteors a mile wide were raining down on the planet. But wait. Didn’t an asteroid wipe out the dinosaurs? Well, yes, but without all those earlier impacts promoting diversity, maybe there wouldn’t have been any dinosaurs in the first place. And if a meteor hadn’t then slammed the dinos, mammals like us might never have made the scene.  So when it comes to space rocks, one man’s ceiling is another man’s flora…and fauna.

[ 本帖最后由 豆豆～ 于 2007-12-19 18:18 编辑 ]