A standard RFID wristband is just the beginning.

Radio changed the very idea of distance. For the first time, information could be transmitted through space without any physical connection between the sender and the receiver. Electromagnetic waves, predicted by James Clerk Maxwell and experimentally confirmed by Heinrich Hertz, became a completely new carrier of information. By the end of the 19th century, the first practical systems of wireless communication showed that a signal could actually travel enormous distances without wires. The prin