“Yo, what’s your WiFi password?” It’s a question we’ve all asked, and answered, dozens of times. Happily, there appears to be a neat way around the issue, as an intrepid Reddit user recently made well ...

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You've probably noticed a square barcode pasted to a graffitied light pole or on the back of a business card. That pixelated code, shaped in a square, is called a QR ...