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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 scarlet macaw displays the colorful plumage that pre-Columbian people wanted for ritual and political displays. Breeding of these birds for their prestigious feathers may have occurred in northwestern Mexico, far from the birds’ tropical homes.
Credit: Mary C. Somerville
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