Amazon is opening its potentially revolutionary checkout-free grocery store to the public today

On Monday, residents of Seattle will have the chance to shop at Amazon Go, the online retail giant's brick-and-mortar grocery store, becoming the first people outside Amazon to try out the cashier-free shopping. Amazon employees started using the convenience store in December 2016, and mastering the technology of using cameras and sensors to charge people the correct amount for their purchase proved harder than expected. Issues included differentiating shoppers with similar body types and...