"NANOCOMPUTER: cascading molecules drive IBM's smallest computer"
IBM researchers have created a simple computation engine that's more than 250,000 times smaller than the most advanced silicon circuitry. Called the world's smallest computer, the system relies on a "molecular cascade" that pushes a handful of carbon monoxide molecules across a copper surface to perform digital logic functions.

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Story in EE Times: http://www.eet.com/at/news/OEG20021024S0047