My friend Jason’s love of Pokémon Go is nothing short of fanatical. The day he downloaded the game to his phone his Fitbit logged 50,000 steps, five times what he walks on an average day. He’s taken to standing up every day at work, not because of the many health benefits, but rather so that every five minutes he can pace from one end of the office to the other to collect PokéBalls and experience points at a nearby PokéStop. Several days in, he started walking home every day from his San Francisco workplace—a journey that takes him daily through the rough-and-tumble neighborhood of the Tenderloin. Jason hardly even noticed as the buildings got more and more rundown—his face was glued to his screen. That was how the mugging happened...

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