You can run, you can hide, but the masterminds in the military’s high-tech research arm have their eyes on a gadget that will allow them to hear your racing heart even as you try to get lost in a crowd.

The Defense Advanced Research Projects Agency already has the technology to hear your heart as you crouch and cower in a dark corner across the room. Now the agency aims to increase its ability to do this at even greater distances, through walls — and even hear and distinguish between multiple hearts at once.

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