Marijuana gingerbread cookies, like this one sold at The Apothecarium in San Francisco, could easily appeal to kids. Jeff Chiu/AP hide caption

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Teen boys are far less likely than girls to check out calorie counts before biting into that burger, researchers say. iStockphoto.com hide caption

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This model of a molar shows color-coded barium banding patterns that reveal weaning age. Ian Harrowell, Christine Austin, Manish Arora/Harvard School of Public Health hide caption

itoggle caption Ian Harrowell, Christine Austin, Manish Arora/Harvard School of Public Health

Morgan Barnett, 7, drinks from containers of 1 percent milk and chocolate milk during lunch at a school in St. Paul, Minn., in 2006. Eric Miller/AP hide caption

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A health worker weighs a Somali baby on scales at a medical clinic in Mogadishu. Babies in Somalia have the highest risk of dying within the first 24 hours after birth. Carl de Souza/AFP/Getty Images hide caption

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Parents can minimize the negative impact of their arguments on their children using a few simple techniques to calm down. iStockphoto.com hide caption

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How much oxygen should severely premature infants receive? A study that sought to answer the question has been criticized for not fully informing parents about the risks to their children. iStockphoto.com hide caption

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Industrial cities like Detroit have high levels of lead in the aging housing stock and in soils. Researchers found that the amount of soil lead in Detroit that gets suspended in the air correlated with the levels of lead in kids' blood. Spencer Platt/Getty Images hide caption

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Students select blueberries and rolls from the food line at Lincoln Elementary in Olympia, Wash., in 2004. John Froschauer/AP hide caption

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