Every winter some twenty million tons of salt are dumped on America's road.That sodium chloride melts the ice, so it prevents its formatin, helping to prevent accidents. But road salt has its downside. This is not very economical because salt is main

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After Connecticut passed a law requiring gun background checks and gun safety courses, gun deaths decreased by forty percent. Forty percent. Prsident Obama today. In his announcement that he would take executive action to require more gun sellers to

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In 1988, the US government instituted a ban on federal funding on Needle Exchange Programs for peole inject Street Drugs.Here is a quote from the article in the July 1998 issue of Scientific American on HIV prevention.Access to clean needles can help

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When patients show up in the hospital with a respiratory illness, they are usually given an antibiotic which do not work against viral infections. Even though most of these respiratroy infections are viral, it is estimated that in these cases antibio

发表于:2018-12-24 / 阅读(62) / 评论(0) 分类 2016年Scientific American(一)月

This is Scientific American 60 Seconds Science. I'm Christine Herman. Got a minute? The ability of distinguish between sounds of varying pitch makes people capable of producing and understand speech and music. And the way we are able to process pitch

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