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 ...

In World War II, the Navajo code talkers of the Pacific used a simple, beautiful code to befuddle the enemy forces and keep American battlefield communications secure. These codes were woven with the ...

Every Black Friday and Cyber Monday, millions of shoppers unknowingly become test subjects in retail's largest behavioral experiment. Under the pressure of flash sales and ticking countdown timers, ...