YeinJee's Asian Journal

A carbon nanotube - a hollow, tube-shaped molecule 10,000 times smaller than a human hair - can perform all the basic functions of a radio when it’s wired up to a few other simple parts, a new study shows.

The simple tube is ten carbon atoms wide and only a few hundred nanometers long.

Alex Zettl and colleagues at the University of California at Berkeley showed that a nanotube can work as an antenna, picking up radio signals from the air. [Nationalgeographic]

I am not really sure if it is useful in common life though.

For those who are wondering how small a nanometer is…

1 meter = 1,000,000,000 nanometer