Radio-frequency Identification chips, or RFID, are miniature transponders which emit an identification signal using radiowaves. They can be attached to most anything and are steadily making their way into nearly every corner of our lives, whether for good—the chip in your cat which broadcasts his address if he gets lost—or for the not so good—the RFID chips in our newest passports, which are terribly insecure and emit a plethora of personal data. Most commonly, though, RFID is being used to track our stuff, like the inventory in a grocery store.