An amazing piece describing an alternate reality where a resuce mission is organized to save the Columbia astronauts.
"But imagine an alternate timeline for the Columbia mission in which NASA quickly realized just how devastating the foam strike had been. Could the Columbia astronauts have been safely retrieved from orbit?
During the writing of its report, the CAIB had the same question, so it asked NASA to develop a theoretical repair and rescue plan for Columbia "based on the premise that the wing damage events during launch were recognized early during the mission." The result was an absolutely remarkable set of documents, which appear at the end of the report as Appendix D.13."