Ten-year-old Matthew Husby gets some low-tech comfort from his dad after surgery at Lucile Packard Children's Hospital in San Francisco, Calif. Heidi de Marco/Kaiser Health News hide caption

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Younger siblings seem to have an immune advantage as early as 1 month of age, which may help explain where they get the energy to tease older siblings. Rebecca Schortinghuis/Getty Images hide caption

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You may share everything with your parents, but health care providers might not be so open. Robert Lang Photography/Getty Images hide caption

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Most people who say they've had a concussion say they sought out medical care at the time. Science Photo Libra/Getty Images hide caption

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Poll: Nearly 1 In 4 Americans Reports Having Had A Concussion

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