Tom Magliozzi's laugh boomed in NPR listeners' ears every week as he and his brother, Ray, bantered on Car Talk. Courtesy of Car Talk hide caption

itoggle caption Courtesy of Car Talk

After the bombs went off Monday in Boston, bystanders, police and emergency personnel rushed to help those who were caught in the blasts, as this video image shows. Marc Hagopian/AFP/Getty Images hide caption

itoggle caption Marc Hagopian/AFP/Getty Images