About earthquakes

Published: May 17 2011 05:15:22 PM EDT   Updated On: Apr 11 2012 09:31:20 AM EDT

Learn what causes earthquakes and look back at the biggest ones to ever rattle the U.S.

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Happiest/unhappiest U.S. cities

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It seems that residents of Louisiana are some of the happiest people in the country, and New Yorkers remain some of the unhappiest, according to a new report. Take a look at the happiest - and unhappiest - U.S. cities.

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