In the crowded cafeteria and library at Columbine High in Littleton, Colorado, two seniors confront hundreds of students and several teachers. They open fire, killing 13 and wounding 23 before committing suicide. A suburban community is left in mourning and a nation in shock.

Each year in America, guns in the hands of kids account for several thousand deaths of young people up to the age of eighteen, and leave thousands more wounded, paralysed, or emotionally scarred. Why are so many kids shooting kids, and what can be done to stem this epidemic of youthful gun violence?