Genes Play Role In Selecting Friends, Study Finds
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Blood Spotting Made Easier
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An Earlier Departure Out Of Africa?
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These primitive tools were found on the eastern edge of the Arabian Peninsula, outside the range of Neanderthals. Researchers say humans may have left Africa earlier than previously thought, crossing what is now the bottom of the Red Sea. Science/AAAS hide caption

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Tools Suggest Humans Left Africa Earlier Via Arabia
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Gabrielle Giffords traveled by ambulance, private jet and helicopter from the University Medical Center in Tucson to a rehabilitation hospital in Houston on Friday. John Moore/Getty Images hide caption

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Giffords Begins A New, Arduous Phase Of Recovery
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Changing Climate Means Changing Oceans
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Young Filmmakers Make Litter Scary
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Assessing The Health Of The Gulf, Post-Spill
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Charlie Riedel/AP
Listen To Prairie Dogs Talk
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How Many Social Network Identities Is Too Many?
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Tracking Carbon Through Your Gut And Beyond
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