World's tiniest RFID tag unveiled

Smart Dust is coming our way...via Hitachi !!

The minute devices measure just 0.05mm by 0.05mm (0.002x0.002in) and to the naked eye look like spots of powder.

They are thin enough to be embedded in a sheet of paper, Hitachi spokesman Masayuki Takeuchi says.

Here the tiny tags can be seen next to a human hair