The Northeast is about to be slammed by a cold front that will take temperatures down into the negative numbers. Know what'll warm you up later this week? A whole bunch of-paid- iPhone -and- iPad apps on sale for free. Today's post has 15 premium apps that are free downloads for a limited time, and you can grab even more if you head back to yesterday's edition . UP NEXT:- This year’s best Android phones still might not be as fast as last year’s iPhone 6s These are paid iPhone and iPad apps that have been made available for free for a

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