By now, most of us know that when surfing the Web we shouldn't click on ads promising us new ways to lose weight without dieting, read emails about magic pills to boost our "egos" or even click on Twitter links about the "shock...

The scanner's results include online sellers — and a map of local stores stocking the item. Bill Chappell/NPR Morning Edition, December 24, 2008 · There has been an explosion...