> Shoppers visiting an Amazon Go store will scan their smartphones upon entering. Cameras and shelf sensors will then work together to figure out which items ha

> Shoppers visiting an Amazon Go store will scan their smartphones upon entering. Cameras and shelf sensors will then work together to figure out which items have been removed and who removed them, the person says; there will be no need for tracking devices, such as radio frequency chips, embedded in the merchandise. Hold on - "shelf sensors"? Wasn't Amazon originally advertising this as being purely camera-based, and that was why everyone was so skeptical it could ever work sufficiently well? 'Shelf sensors' could cover a heck of a lot short of embedding individual RFID sensors...