About earthquakes

Posted: 5:15 PM EDT May 17, 2011   Updated: 9:31 AM EDT Apr 11, 2012

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

 
 
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States with the most smokers

smoking cigarette with ash

Zsuzsanna Kilian/SXC

With Tuesday marking World No Tobacco Day, check out where people still smoke the most in the United States.

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