Shop for groceries at the bus station? That's something you can already do in South Korea, where the traditional grocery store is being nudged out of the way by an interesting new approach to shopping that combines a large "aisle" display and QR codes. A kiosk shows a typical array of products that would be found on one aisle of a grocery store. You hold up your smartphone, scan the QR code of the product you want, and that item gets added to your virtual shopping cart. The groceries are delivered later in the day, after commuters are home from work.