Obviously, the loss of Columbia was horrifying and tragic, but retiring the entire shuttle program over that seemed like curing the flu by killing the patient - at least to me. Before that, the last shuttle accident like that was in the 80's - those seem like pretty good odds to me. And most of the shuttles were, in fact, made in the 80's, I realize that. But by the time Columbia had crashed and burned, it had only existed for a quarter of its design life. Other shuttles could've been built, and the tanks could've been further modified. But cancelling the entire program, even in favour of Orion never did seem to make sense. A Low Earth Orbital System like the shuttle does, though. It was incredibly useful, it seemed. What are your thoughts on NASA's retiring the Space Shuttle Program?