Alex Zettl, a professor of physics at UC Berkeley, has made a radio out of a single carbon nanotube that's about 10,000 times thinner than a human hair. It runs on batteries and you need headphones to use it, but it tunes in stations on the FM dial. Zettl and his team last year received their first FM broadcast, which turned out to be "Layla" from Derek and the Dominoes.
This is a few months old, but still, it's very interesting. And nanotechnology has been added to my list of fears.
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