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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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A Breed Apart
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Macaw pens at the prehistoric site of Paquimé in northwestern Mexico were made of adobe and contained stone doors with stone plugs. New research suggests that large-scale breeding of scarlet macaws occurred there.
Credit: A. Somerville
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