Workers at an Amazon Go store, currently open only to Amazon employees, are seen through an exterior window as they make sandwiches inside, Thursday, April 27, 2017, in Seattle. Amazon.com Inc. reported a first-quarter profit of $724 million. The Seattle-based company said it had profit of $1.48 per share, topping Wall Street expectations. Amazon Go shops are convenience stores that don't use cashiers or checkout lines, but use a tracking system that of sensors, algorithms, and cameras to determine what a customer has bought. (AP Photo/Elaine Thompson)