An ambulance drove down the street between us, and I imagined who it was carrying, and what had happened to him. Did he break an ankle attempting a hard trick on his skateboard? Or maybe he was dying from third-degree burns on ninety percent of his body? Was there any chance that I knew him? Did anyone see the ambulance and wonder if it was me inside? What about a device that knew everyone you knew? So when an ambulance went down the street, a big sign on the roof could flash DON’T WORRY! DON’T WORRY! if the sick person’s device didn’t detect the device of someone he knew nearby. and if
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