Shoppers can load up their bags and walk right out of the supermarket. Amazon's first Go Grocery store will open its doors in Seattle on Tuesday, welcoming shoppers to walk in, grab what they need and ...

The concept seems simple, yet the technology behind it is remarkably complex. It’s pay-as-you-go, self-service in the purest form; walk into a store, pick up an item and just walk out. The technology ...