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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.
Learn more about global warming in Michael Crichton's State of Fear (Unabridged).
Want more Scientific American? You can listen to previous issues by clicking on archives under periodicals.
©2005 Scientific American

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