Do you really need that MRI, or is your doctor just trying to make a buck? iStockphoto.com hide caption

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Kate Donnellon Nail, 43, works out regularly and eats well. She never thought she would have a problem conceiving a child. Anna Kuperberg/www.kuperberg.com hide caption

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U.S. Navy doctors Lt. Cmdr Ralph Pickard (left) and Ens. Jesse Rohloff study a patient's mammogram images at the National Naval Medical Center in Bethesda, Md. CWO4 Seth Rossman/U.S. Navy hide caption

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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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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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A Harvard study found dramatically higher BPA exposure in people who ate canned soup. The researchers used different varieties of Progresso-brand vegetable soups, but BPA is found in the epoxy resins used to coat the inside of many food and beverage cans. Maggie Starbard/NPR hide caption

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Anthropologists say early humans who hunted and gathered had longer jaws to hold all those teeth. iStockphoto.com hide caption

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The scarcity of ADHD medications is a problem faced by an untold number of children and adults with the disorder. GoodMood Enterprises/iStockphoto hide caption

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