Who said anything about a CD?
I cannot understand your continuing point, then?
....because....over the years I have seen you "question" the collapses of the WTC 1 & 2. AND just in this thread, "question" the last 13 years of engineering graduates who pay around $100,000 for their degrees.
So....this thread is ABOUT the modelling of the collapses of THREE buildings, on 11 September, 2001. MANY very prominent explanations have been put forward, over the last 13 years. NONE (that are viable) involve controlled demolition (which is a provenance ONLY of those in the so-called "truther movement").
So, what is left? Logically? This is not meant as a 'rhetorical' question. It is about LOGIC, and science.