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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America's 10 favorite dog breeds

Labrador retriever puppies

American Kennel Club via CNN

With Friday marking National Dog Day, check out which 10 dog breeds are the most popular in the U.S., based off American Kennel Club registration numbers for 2015.

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