"The world's smallest and thinnest RFID tags were introduced yesterday by Hitachi. Tiny miracles of miniaturization, these RFID chips measure just 0.05 x 0.05 millimeters..."

These extremely small and inexpensive chips could easily be incorporated into any product, or simply scattered like dust for tracking purposes. Far smaller than a grain of table salt and invisible to the naked eye, you could easily swallow them without even noticing!

See: TechNovelgy article (2007-02)