【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

想不到这几天老米还是蛮有效率的.恩,不错不错.;d:

豆豆～UID: 2378384

Contented Cows Produce Wood Content

We all know what comes out of cows.  And I’m not talking about about milk.  What I am talking about it so-called “bovine digested solids.”  That’s the genteel term used by Jerrold Winandy of the US Forest Products Lab in Madison, Wisconsin.  Who has found a new use for brown cow creations.  At the recent World Dairy Expo in Madison, he displayed paper and particle board made from bovine digested solids.

Because dairy cows munch on grass, they churn out a lot of cellulose in addition to milk.  And, Winandy says, there’s a big industrial demand for wood fiber, which is also made of cellulose.  It’s used in inexpensive furniture, like the desk on which your computer may rest.


After the so-called bovine digested solids get further digested by bacteria to convert some of it to methane to run generators, the cellulose fiber remains.  Winandy and his colleagues are looking at how well it could combine with wood fiber.  A successful mix would reduce the need for wood and earn dairy farmers a much-needed extra buck.  Let’s hope the idea doesn’t flop.

[ 本帖最后由 豆豆～ 于 2007-11-30 16:54 编辑 ]

深海lavenderUID: 2350207

up.

深海lavenderUID: 2350207

顶．

深海lavenderUID: 2350207

早上下果然快很多......看来早起就是有好处啊.;d:

深海lavenderUID: 2350207

UPUP.

深海lavenderUID: 2350207

有更新没?

maureenyaoUID: 2360848

ｔｈａｎｋｓ

formattingUID: 2312404

thank you very much

lqat417UID: 2432790

mp3下载的速度好慢哦～

深海lavenderUID: 2350207

找人少的时候下就快了.

buaa_wangchaoUID: 2179665

好东西，顶！

liao1858UID: 2430987

thanks 啊

深海lavenderUID: 2350207

老米那边现在还在放假......SIGH...要等到明天了.懒的可以.

豆豆～UID: 2378384

Even Low Lead Levels Lower IQ

Toy companies and parents reacted quickly this year when some toys made in China were found to contain lead.  Because lead is known to affect kids’ cognitive development.  In 1991, the Centers for Disease Control set a federal standard of 10 micrograms of lead per deciliter of blood.  So the eight percent of US kids five and younger who have lead levels between 5 and 10 micrograms are considered safe.  But recent Cornell University research in the journal Environmental Health Perspectives supports a stricter standard.   

The research team had previously followed kids from birth through age five. The current study looked again at the children at age six.  The kids were divided into two groups: one with blood lead levels between 0 and 5, and the other with 5 to 10—again, currently considered okay. Turned out that those in the 5-10 group had IQ scores about five points lower than those with the lowest lead levels.  Scientists say this could affect educational performance later in life.  They recommend reconsidering federal standards for lead in consumer products and reevaluating the acceptable blood lead levels in children.

[ 本帖最后由 豆豆～ 于 2007-12-3 14:28 编辑 ]