If you’ve returned to the restaurants and bars that have reopened in your neighborhood lately, you might have noticed a new addition to the post-quarantine decor: QR codes. Everywhere. And as they’ve ...

QR codes have quietly become the remote control for everyday life, from restaurant menus to parking meters to office sign-ins. That convenience is exactly why security experts keep repeating a simple ...

SAN FRANCISCO — When people enter Teeth, a bar in San Francisco’s Mission neighborhood, the bouncer gives them options. They can order food and drinks at the bar, he says, or they can order via a QR ...