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Publisher's Summary

This issue contains five articles:"Are Aliens Among Us?": Scientists are searching for life forms on Earth that are radically different from all known organisms."Making Carbon Markets Work": Limiting climate change without damaging the world economy depends on stronger and smarter market signals to regulate carbon dioxide."Diet Advice from DNA": Internet marketers claim that a genetic test can give you a personalized diet."The Semantic Web in Action": Corporate applications on the Internet are coming - and consumer uses for them are emerging."The Many Worlds of Hugh Everett": A profile of physicist Hugh Everett. After his now celebrated theory of multiple universes met with scorn, Everett abandoned the world of academic physics. His life became centered on top-secret military research - and it ended tragically.
©2007 Scientific American
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