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A replica of the pinky bone fragment found in a Siberian cave. Researchers used the bone bit to extract and sequence the genome of a girl who lived tens of thousands of years ago. Max Planck Institute for Evolutionary Anthropology hide caption

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Max Planck Institute for Evolutionary Anthropology

Two men from northwestern Missouri became ill after tick bites infected them with a previously unknown virus. iStockphoto.com hide caption

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iStockphoto.com

People walk in the storm surge from Hurricane Isaac along Lake Pontchartrain in New Orleans. Isaac was later downgraded to a tropical storm as it continued to grind its way through the Gulf Coast, dropping torrential rain and generating dangerous storm surges. Gerald Herbert/AP hide caption

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Gerald Herbert/AP

A Beechcraft airplane sprays insecticide over Dallas early Monday morning to curb the spread of West Nile virus. LM Otero/AP hide caption

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LM Otero/AP

With West Nile On The Rise, We Answer Your Questions

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Research suggests basic forms of learning are possible while snoozing. iStockphoto.com hide caption

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iStockphoto.com

Can You Learn While You're Asleep?

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