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Tiny perfect rings
Single-Crystal Nanorings Formed by Epitaxial Self-Coiling of Polar Nanobelts, Science 303, 27 February 2004, pp. 1348-51. Here's a pic. I'd post the link, but it's available only to subscribers. I do have the .pdf of the article, though, and if any nanotech freak wants a copy, let me know and I'll e-mail it.
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