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This App Warns You if Someone Is Wearing Smart Glasses Nearby - 404media
(www.404media.co)
This is a most excellent place for technology news and articles.
Except that one cool thing with AR is being able to have it tell what you're looking at is. Not just positioning things in space. A lot of cool shit that could be done with AR, like real time text translation, object identification, etc needs some kind of camera, even if it just sees IR light. Lotta cool shit needs a microphone, too.