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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Famous female trailblazers in sports

Jen Welter, Arizona Cardinals news conference

Ralph Freso/Getty Images

Jen Welter, who made history this week by becoming the first woman to hold a coaching position in the NFL, is only the latest woman to blaze a trail in the world of sports. Click on for some others.

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