University of California Berkeley Professor Dacher Keltner, an expert in social psychology and well-known author, discusses how kids could react to the recent Boston Marathon bombings. (Photo by Associated Press/The Boston Globe, John Tlumacki)
In this April 15, 2013 file photo, an injured woman is tended to at the finish line of the Boston Marathon after two bombs exploded within seconds of each
In this April 15, 2013 file photo, an injured woman is tended to at the finish line of the Boston Marathon after two bombs exploded within seconds of each other. More than 180 people were hurt in the explosions, and at least 14 of them lost all or part of a limb. But one week after the Boston Marathon bombings, doctors say everyone injured in the blasts who made it alive to a hospital now seems likely to survive. (AP Photo/The Boston Globe, John Tlumacki)