Black and white against a background of green trees and blue sky. Until recently, the only thing like that you'd see on a nature walk were birds and animals. But now with the popularity of QR -- or ...

Among the many changes brought about by the pandemic is the widespread use of QR codes, graphical representations of digital data that can be printed and later scanned by a smartphone or other device.

Many of you reading this have undoubtedly seen a QR (Quick Response) code by now (the thing pictured to the right), but there's just as much -- if not more -- confusion surrounding them today as there ...