While this MSNBC article on the 7 "myths" of the Challenger shuttle explosion doesn't contain much new information, it is a concise summary of all the things which have been discovered since that fateful day twenty years ago. I remember sitting in my high school library trying to do research for my very first "term paper" when the school secretary ran in and started babbling to my English teacher about a "shuttle exploding". I just rolled my eyes thinking how the press always screws things up, exaggerating what was most likely some sort of stupid little fire on the pad.
See? I have a long track record of getting breaking events 180 degrees wrong.