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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

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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

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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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经济学人科技系列

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By Douglas Bakshian Manila 11 June 2006 Police investigators take a look at the damage caused by a suspected homemade bomb or a grenade as it exploded in a bus being used as a mobile police station in Manila's suburban Quezon city Philippine police

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2006年VOA标准英语（六月）

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