SAN FRANCISCO — The Amazon Go grocery store, now in the testing stage in Seattle, sounds like a dream come true for holiday shoppers waiting in long lines. The underlying technology seems to be routed in terra firma, however, a mix of cameras, microphones and the massive servers that Amazon uses to run its cloud computing service and power digital assistant Alexa. The concept promises to let shopp
![How Amazon's line-less grocery service might really work](https://cdn-ak-scissors.b.st-hatena.com/image/square/ad42933f16bfeb02ce74f9827e2dff8387d8e87b/height=288;version=1;width=512/https%3A%2F%2Fwww.usatoday.com%2Fgcdn%2F-mm-%2F4901232983ba2eb7fc3b3e6aab8a4428d697e89b%2Fc%3D39-0-908-491%2Flocal%2F-%2Fmedia%2F2016%2F12%2F06%2FUSATODAY%2FUSATODAY%2F636166371206128037-Screen-Shot-2016-12-06-at-1.04.46-PM.jpg%3Fwidth%3D869%26height%3D491%26fit%3Dcrop%26format%3Dpjpg%26auto%3Dwebp)