Michele Pereira, who questions the schedule of mandatory vaccines, sat with her daughters, Evangeline, 6, right, and Genevieve, 2, at a park in Ashland, Ore., earlier this month. Jeff Barnard/AP hide caption

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An Amnesia Patient's Strange Power Of Recall
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Science Diction: The Origin Of 'Stethoscope'
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A Tale Of Two Addicts: Freud, Halsted And Cocaine
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Cholesterol-fighter simvastatin, the generic version of Zocor, gets a clean bill of health in an update to a study dating back to '90s. JB Reed/Landov hide caption

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Geron To End Embryonic Stem Cell Research
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H5N1 avian flu viruses (seen in gold) grow inside canine kidney cells (seen in green). Cynthia Goldsmith/CDC hide caption

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The most common cause of brain injury in premature infants is a lack of oxygen in the days and weeks after birth, researchers say. Ibrahim Usta/AP hide caption

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Why Brain Injuries Are More Common In Preemies
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Tokay Geckos, like this one perched on a twig in suburban Quezon City, Philippines, are being hunted and killed to satisfy booming demand for them as an ingredient in alternative medicines. Bullit Marquez/AP hide caption

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Republican presidential candidate Gov. Rick Perry of Texas prepares to speak at a dinner in Bettendorf, Iowa, Monday. Two years ago Perry signed into Texas law an insurance mandate covering controversial tests for heart disease. Charlie Neibergall/AP hide caption

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