World's 20 smartest countries

POSTED: 11:41 AM PDT Oct 09, 2013    UPDATED: 09:38 AM PDT Oct 24, 2013 
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According to a recent survey, American adult proficiency in literacy, numeracy and problem solving ranks as some of the lowest among developed countries, despite a relatively high level of education. Take a look at the world's 20 smartest countries.