Psychologists say spanking and other forms of corporal punishment don't get children to change their behavior for the better. Science Photo Library/Corbis hide caption

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Does she really think you're funny, or is she just being polite? Jon Feingersh/Getty/Getty Images/Blend Images RM hide caption

itoggle caption Jon Feingersh/Getty/Getty Images/Blend Images RM

When researchers at Weill Cornell Medical College scanned teenage brains, they found that the area that regulates emotional responses has to work harder to keep impulses in check. Courtesty Kristina Caudle/Developmental Neuroscience hide caption

itoggle caption Courtesty Kristina Caudle/Developmental Neuroscience

Play now, pay later: consistency matters when it comes to kids and sleep. iStockphoto.com hide caption

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Eye contact may prove persuasive only if a person's already on your side, a study finds. iStockphoto.com hide caption

itoggle caption iStockphoto.com