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Publisher's Summary

In the cover story, we'll hear about special genetic changes that enable scientists to trace human migrations over thousands of years. Also, we'll hear about the possibility of a "Cool Early Earth", bomb-sniffing sensors that may replace police dogs, the forgotten era of brain-stimulating chips, and new developments in the world of wi-fi Internet.
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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