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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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Antimatter lightning
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During two recent lightning storms, the Fermi telescope found evidence that positrons, not just electrons, are in storms on Earth.
Credit: Axel Rouvin/Flickr
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