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This is Scientific Americans 60-Second Science. Im Cynthia Graber. This will just take a minute. Saliva contains many useful components: lubricants, enzymes for breaking down food and now compounds that can reveal a persons age. Thats according to a

发表于:2018-12-24 / 阅读(64) / 评论(0)

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SSS 2010-03-23

Ever get a sour stomach after your morning coffee? Well, you might end up switching to a dark roastbecause that coffee concoction may leave you with a happier tummy. That's according to the research presented at the American Chemical Society meeting

发表于:2018-12-24 / 阅读(66) / 评论(0)

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AGRICULTURE REPORT - Restrictions on Methyl Bromide

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发表于:2019-01-06 / 阅读(88) / 评论(0)

农业与发展

Study: Loss of Ozone Slows

By Caty Weaver Broadcast: September 12, 2003 This is Bob Doughty with the VOA Special English Environment Report. Scientists in the United States have reported some good news about the 1)ozone in the

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经济学人69:外因遗传与压力新生儿蓝调曲

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发表于:2019-01-26 / 阅读(58) / 评论(0)

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AGRICULTURE REPORT - Cover Crops

AGRICULTURE REPORT - Cover Crops By Mario Ritter Broadcast: Tuesday, March 23, 2004 This is Steve Ember with the VOA Special English Agriculture Report. The idea to grow a crop that improves the land

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