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October 24th, 2005
Our ability to work at the nanoscale -- using new tools to observe atoms, manipulate molecules, and build structures -- is advancing rapidly. A few days ago, we reported on the success of scientists at Rice University in constructing a nanoscale car. This is an excellent example of building "from the bottom up," precisely combining atoms to make working machines.
Another approach to building nanoscale structures is "from the top down."
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