Imagine a warehouse buzzing with tiny drones that automatically track and monitor inventory from afar, leaving workers free to manage and move material. That's the new system developed by MIT researchers, which could prevent mismatches and help employees find particular items faster on top of looking really cool with a bunch of worker drones zipping around. Most importantly, small drones fly around safely as they read RFID tags on inventory from "tens of meters away" with a 19 cm margin of error, according to a report introducing the system. But warehouse-safe tiny UAVs aren't big enough to carry RFID readers that reach such a range -- so the MIT researchers simply made the drones relay signals from standard readers to items and back. That means these little fleets can work with existing RFID-reading systems, software and tags.