Features

• Making Carbon Markets Work

  Limiting climate change without damaging the world economy depends on stronger and smarter market signals to regulate carbon dioxide
  * Supplement: Extended version

  David G. Victor and Danny Cullenward   | December 1, 2007  |

• Diet Advice From DNA

  Internet marketers claim that a genetic test can give you a personalized diet. Are they advertising cutting-edge science or a high-tech horoscope?

  Laura Hercher   | December 1, 2007  |

• Window on the Extreme Universe

  The GLAST satellite is about to open up an unexplored region of the electromagnetic spectrum--just the region, in fact, where signs of dark matter and other mysterious phenomena may show up

  William B. Atwood , Peter F. Michelson and Steven Ritz   | December 1, 2007  | 2

• The Semantic Web In Action

  Corporate applications are well under way, and consumer uses are emerging

  Lee Feigenbaum , Ivan Herman , Tonya Hongsermeier , Eric Neumann and Susie Stephens   | December 1, 2007  | 2

• 

  The Many Worlds of Hugh Everett

  After his now celebrated theory of multiple universes met scorn, Hugh Everett abandoned the world of academic physics. He turned to top-secret military research and led a tragic private life
  *Supplement: The Many Interpretations of Quantum Mechanics

  Peter Byrne   | December 1, 2007  | 6

• Puzzle: In Boxes

  Our year-end crossword challenges your knowledge of science. Try the printed puzzle or a harder version.

  Patrick Merrell   | December 1, 2007  | 1

• Radiant Information

  State-of-the-art light microscopy illuminates the exquisite details of life

  Emily Harrison   | December 1, 2007  | 2

• Are Aliens Among Us?

  In pursuit of evidence that life arose on Earth more than once, scientists are searching for microbes that are radically different from all known organisms

  Paul Davies   | December 1, 2007  | 58