Doesn't matter if you're a ninja or a polar bear blinking in a blizzard—if you've got a heartbeat, this new sensor system will find you. It's called "Biometrics-at-a-distance" and does everything but smell your fear.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/f9z_b_mC1vM/peek+a+boo-darpas-developing-sensors-to-track-you-by-your-heartbeat
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