@cbsnews: After a school shooting, one of the hardest questions for parents to grapple with is how to handle the room of a child who was killed. Do you box up their belongings or do you leave them untouched? Over the last six years, heartbroken parents across the country opened their doors to CBS News’ Steve Hartman and photographer Lou Bopp, so that others could get a glimpse into some of these rooms – now frozen in time. An unmade bed... A library book 12 years overdue... A backpack – still open – after soccer practice... Step through the bedroom doors of eight American children, who left for school one day and never came home.