Playing Pinball with Atoms

With nanotechnology yielding a burgeoning menagerie of microscopic pumps, motors, and other machines for potential use in medicine and industry, here is one good question: How will humans turn those devices on and off?

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<p><a href="http://www.physorg.com/news142485328.html">Playing Pinball with Atoms</a></p> <p>With nanotechnology yielding a burgeoning menagerie of microscopic pumps, motors, and other machines for potential use in medicine and industry, here is one good question: How will humans turn those devices on and off? </p>