QR codes — or "Quick Response" codes — are square-shaped barcodes that can be scanned by mobile devices. They are used for a variety of applications, from pulling up a restaurant menu to directing ...

Two-dimensional (2D) barcodes, more prominently recognized as QR codes, are back in fashion—with much demand for just about 'contactless' everything these days. Coinbase didn't waste time in seizing ...

🛍️ The best Cyber Monday deals you can shop right now (updating) 🛍️ By David Nield Updated May 9, 2023 8:00 AM EDT Get the Popular Science daily newsletter ...