“The 3 reports concerning the possible tile damage on the Columbia prepared by the Boeing engineers have become increasingly important as the investigation has developed. The reports provided the rationale for NASA officials to curtail further research (such as photographing the Columbia with spy cameras) on the tiles during the flight. Here is a close analysis of an important slide from a Boeing report. This discussion was prepared for a chapter on the cognitive style of PowerPoint in my new book Beautiful Evidence; the comments here therefore assess both the reasoning about the evidence as well as the methodology of presentation.”