I haven't read the Gehman Report on the Columbia accident in its entirety, though I've skimmed the whole thing, treading lightly on parts with which I'm already (unfortunately) all too familiar. These included the history of manned space flight in the U.S., and the specific technical description of what went wrong. The latter, in fact, is almost irrelevant to policy formulation per se — it's only of importance to those at NASA who have to implement specific technical fixes. In any event, I've read enough to know that there's little new here, to anyone who's followed the vagaries of...