Archeologists Locate Source of Mayan Relics

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Weaker Rita Slogs North Through Texas

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FEMA Takes Different Approach to Rita

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Weakening Rita Hits Gulf Coast, Moves Inland

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Researchers Examine Immune Cells' Workings

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Research Finds Stem Cells Aid in Spinal Cord Repair

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Researchers Track an Odd Genetic Disorder

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Scientists: Male Chromosome Won't Lead to Extinction

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Weight-Loss Surgery Spreads; So Does Debate

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Discovery's Crew Happy with Safe Return

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Shuttle Slows for Touchdown in California

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Shuttle Landing Delayed Due to Poor Weather

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Weather May Cloud Shuttle's Monday Return

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A New Mission to Mars

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'Snuppy' Represents Latest Cloning Advance

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