Soda bottles and household chemicals are sometimes used to make low-power bombs. iStockphoto.com hide caption

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Beheading Barbie is the kind of aggression that can cause sibling distress. iStockphoto.com hide caption

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Barton Holmes, 2, sits with his father, Kevin Holmes, and his mother, Catherine McEaddy Holmes, during an appointment at Children's National Medical Center in Washington, D.C. Maggie Starbard/NPR hide caption

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Popular prescription drugs like statins are causing more childhood poisonings. Matt Rourke/ASSOCIATED PRESS hide caption

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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

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