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In contrast, DNA computing and the like are still curiosities with no clear path to practical high-speed computing.
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One exciting development, which has emerged just in the past year or two, is nanotubes, i.e. cylindrical buckyballs.
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It was recently discovered that a nanotube can be "tuned" from insulator to semiconductor to conductor just by changing the pitch of the helical structure of carbon atoms.
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Kinks introduced in a tube can be used to form a conductor-semiconductor junction.
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Molecular modeling is being used to further explore some of the possibilities.
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