At first glance, the stickers affixed next to the bathroom entry door, a check-in kiosk, or a counter at Starbucks don’t look like much. But when flyers passing through the Albany International Airport in New York scan those stickers with their phone cameras, a new app developed by GE and its partners unlocks valuable data stored in a quick-response (QR) code printed on their backs. The app, called Wellness Trace, can tell them when the bathroom was last cleaned, say, or the check-in kiosk sanitized.