Sooooo sneaky. The Pentagon is working with North Dakota researchers to turn man-made stones into hidden sensors, Technology Trends notes.
RFID sensors... will be installed in fake little rocks. These 'rocks,' which will be the size of golf balls, will be sent from an aircraft and will detect enemies by 'listening' to them from 20 to 30 meters. These sensors should be operational within 18 months and they should be cheap enough to leave them on the battlefield after they completed their tasks.
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