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Imagine if you lost your keys and instead of fishing around in the couch cushions, you could just pull out your phone and search for them. This is not only possible; it's possible now, and it's almost as intriguing as it is terrifying. Today at Microsoft Build, the software giant's annual conference for developers, Microsoft showed off exactly this sort of tech. By melding things that have already been around for a few years--machine-learning powered image recognition and consumer-grade cameras--with the ludicrous computing horsepower in the cloud, Microsoft is able to index people and things in a room in real time. Once you can identify people and objects by feeding the computers images of Bob and jackhammers so they can learn what each of those things look like, you can start applying a framework of rules and triggers on top of the real world.