Teaching A Chimp To Speak In 'Project Nim'

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Political Negotiations Also Shaped By Human Psychology

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This undated X-ray image from the Cleveland Clinic shows electrodes implanted in a patient's brain. The method, known as deep brain stimulation, has traditionally been used to treat diseases such as Parkinson's, but new research indicates it could be helpful for patients with obsessive-compulsive disorder. AP hide caption

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Parkinson's Treatment Could Work For OCD, Too

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New Device Reduces Seizures, No Surgery Required

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James Kennedy, an amateur collector, found this fossilized bone with a mammoth or mastodon engraving in Vero Beach, Fla. It has been identified as one of the oldest pieces of prehistoric art in the Western Hemisphere Chip Clark/Journal of Archaeological Science hide caption

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Florida Fossil Hunter Gets Credit For Big Find

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A Tale Of Two Addicts: Freud, Halsted And Cocaine

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Exploring 'The Wild Life Of Our Bodies'

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Remodeling Hearts With Stem Cells

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Poor Peer Review Cited In Retracted DNA Study

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Genome Maps May Spot Disease In African-Americans

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Bottles of antiretroviral drug Truvada, a medicine used in trials that showed a reduction in transmission of HIV between heterosexuals. Justin Sullivan/Getty Images hide caption

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A Promising Game-Changer In HIV Prevention

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Dr. Donald Brown, left, gives 14-year-old Kelly Kent a dose of Gardasil, a vaccine for the human papillomavirus in 2006. The group that advises the U.S. government on vaccination recommendations is now starting to take costs for vaccines like Gardasil into consideration as vaccine prices rise. Charles Rex Arbogast/AP hide caption

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Rising Costs Complicate Vaccine Guidelines

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