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October 9th, 2004
How small can nanotech get? Picture cancer cells in the human body glowing like Christmas trees. This lets their nuclei and other parts stand out so they can be studied.
The light comes from minute — just a few mere atoms across — bits of siliconlike material planted in the cells. Scientists have dubbed this material "quantum dots," and they are not musings of some distant future. The dots are here now.
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