the launch had a special meaning for some schoolchildren in point st. john, florida. abc s john quinones went to see them. reporter: children of challenger 7 elementary had been waiting for this day since challenger explosion. many of these kids were eyewitnesses to this tragedy. i just fell apart when it blew up. reporter: the kids spent hours painting posters, building shuttle models and writing down in words sentiments of the heart. dear nasa, hope this launch is a good one. i hope no one gets hurt going