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Publisher's Summary

In the cover story, we'll take a look at the curious discrepancies between theory and observations of the "music" of the cosmic microwave background. Then, new fossil evidence reveals that animal life is even older than we thought. Also, we'll hear about new approaches to preventing and treating aneurysms, the challenge of symbolic thinking, and disease-treating antibody-replacements derived from camels.
©2005 Scientific American
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