Of the two communication apps that Google announced at I/O, Duo surely seemed like the less interesting one. Video calls have been done again and again, and by now, if you have someone you want to talk to and see at the same time, odds are you already have your preferred way of doing that. But my last few days with Duo have shown me another side to the story. Duo isn't trying to revolutionize video calls, it just wants to approach them from a more modern perspective, one that builds on our smartphone-carrying habits, our needs for immediacy, and our disdain for complexity.

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