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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Halloween: By the numbers

Halloween cupcakes

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Shoppers will spend an estimated $7.4 billion on Halloween this year. Check out some other surprising numbers behind this ghoulish holiday.

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