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Source:
Scientific American. Sep2007, Vol. 297 Issue 3, p44-46. 2p.
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Source:
Scientific American. Sep2008, Vol. 299 Issue 3, p8-8. 1p. 1 Color Photograph.
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Source:
Scientific American. Sep2005, Vol. 293 Issue 3, p14-14. 1/4p. 1 Color Photograph.
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