QR codes. You've seen them everywhere, even though you might not have even realized it. They are those black and white patterns in square boxes popping up on posters, ads, magazines and soon, almost everywhere. What are they?
What is a QR Code? …
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!["How I Met Your Mother"](http://mylt.ltcdn.com/d6/sites/mylifetime.com/files/images/imagecache/carousel_159x119/2011/01/12/HIMYM-159x119.jpg ""How I Met Your Mother"")
