Nurse Susan Peel gives a whooping cough vaccination to a high school student in Sacramento, Calif. The whooping cough vaccine given to babies and toddlers loses much of its effectiveness by the time people reach their teens and early adulthood. Rich Pedroncelli/AP hide caption

itoggle caption Rich Pedroncelli/AP

Connor Galloway, age 12, was found dead in his bedroom with a belt looped around his neck. Connor's friends admitted to his mother that they'd been talking about playing "the choking game." Courtesy of the Galloway family hide caption

itoggle caption Courtesy of the Galloway family