The world's smallest radio has been developed which is many thousands of times smaller than the thickness of a human hair. Talk about nanotechnology!!! It is made out of carbon nanotubes which are just a few atoms thick. When a team at the University of California tested it, they transmitted classical music to a speaker from an Apple (AAPL) iPod several yards away.
The next step in nanotech is 'smart dust', which can detect movement, heat or light.
Author owns AAPL.