I can only take so much re-hashing of what we don't know. Yes lets Mourn those who gave thier lives in this and simular past disasters. Lets Learn from what happened today

(lets not keep guessing and speculating on something we probably will not ever know as fact and may be months before they have any "Educated" Guesses from the 100s - 1000s of experts who will be investigating this in detail.).

As J-Reid said earlier, go outside and look to the sky - I plan to a couple of times today and evening, and remember the lost. Also, remember the dream which made each and everyone in the space program feel the risk is worth taking. The Future is ahead and we (i mean the world) has to work together and continue to "push the envelope" of our knowledge. If we don't we will sink into our comfortable little couches of what ifs and hopelessly sink back into the dark ages.