The Challenger explosion issue is a clouded one, though. Many people who thought they saw it live didn't do so... because they were able to watch it again, multiple times. And when they saw it, it sure may have looked live even if it were a few hours later. I remember that because we watched CNN's coverage in a class later that day and, while it was interspersed with footage of debris as well and discussions about the search and rescue efforts, it could easily have been mistaken for being live, particularly for a younger school kid because the explosion was so vividly searing into our brains compared to the talking heads and discussion about recovery.