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Corrections

Mar 28, 5:48 pm
An earlier version of this article stated that a 7.0 magnitude earthquake was about 100 times more powerful than a 6.1 magnitude quake. The 7.0 quake is actually 23 times more powerful.
Mar 14, 12:20 pm
A previous version of this story reported that a GE executive had said that 35 billion gallons of water are used in U.S. shale gas wells each day; in fact, that is the amount used each year.
Mar 11, 11:55 am
An earlier version of this story reported that there were overage charges for Verizon's iPad 2 data plan. A Verizon spokesperson later clarified that this is not the case.
Mar 8, 4:27 pm
An earlier version of this story said the U.S. paper currency was 100% cotton. U.S. notes are 75% cotton fiber and 25% linen. Linen is derived from flax.
Mar 8, 10:21 am
Google's recent change to its search algorithm has dramatically shaken up the businesses of websites that moved up or down its search rankings. Sites whose rankings rose to the top found that their traffic and revenue soared -- but the adjustment had an equally devastating effect on those that were dropped.  
Mar 2, 2:14 pm
An earlier version of this story incorrectly stated that the NYSE makes up about 50% of the U.S. equity trading volume. It controls 27%.
Feb 28, 2:55 pm
An earlier version of this story incorrectly reported that ADT does not serve apartment dwellers. They do offer products for renters, including a wireless system that is comparable in price to SimpliSafe's. However ADT's product requires a three-year contract and installation by a professional.
• Corrected article:  David vs. Goliath
Feb 24, 3:05 pm
An earlier version of this story incorrectly identified Lockheed Martin's C-130J as a jet. It is a turboprop plane.
Feb 24, 7:24 am
An earlier version of this article incorrectly attributed the Democratic reaction to Senate Majority Leader Harry Reid. It was House Minority Leader Nancy Pelosi.
Feb 23, 1:00 pm
A previous version of this story incorrectly calculated the maximum deal total as $41.1 billion, due to a double-counting of the equity. The correct deal total is $29.5 billion. Our apologies for the error.

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