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In the December 5 Issue:
- TABLE OF CONTENTS
- Climate might be right for a deal: Copenhagen negotiations will take steps toward a climate-stabilizing treaty
- Botanical Whales: Adventures in the Tortugas reveal that seagrass fields need saving too
- Breaking the Speed Limit: Studies examine physiology and technology to better foresee the ultimate edge of human performance
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Cosmic ray puzzle
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Using fluorescence detector telescopes at the Pierre Auger Observatory in Argentina, astronomers say they have found evidence that many of the highest-energy cosmic rays are iron nuclei rather than protons. Another cosmic ray observatory, however, reports no sign of iron.
Credit: Auger
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