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That's an easy answer. Compare these results

http://www.google.com.ar/search?q=165+ars+to+usd&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:es-AR:official&client=firefox-a
http://ar.search.yahoo.com/search?p=165+ars+to+usd&fr=yfp&toggle=1&cop=&ei=UTF-8&rd=r1
http://www.bing.com/search?q=165+ars+to+usd&go=&form=QBLH&filt=all

http://www.google.com.ar/search?q=tiempo+en+buenos+aires&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:es-AR:official&client=firefox-a
http://ar.search.yahoo.com/search;_ylt=A0oG757z6CZLEA0BOvir9Qt.?p=tiempo+en+buenos+aires&fr2=sb-top&fr=yfp&rd=r1&sao=0
http://www.bing.com/search?q=tiempo+en+buenos+aires&go=&form=QBRE&filt=all


Google>>>>Yahoo>>>>Bing. Google's much more "intelligent", it knows better what you intended to search and it's infinitely more convenient