Look at this simple gravity driven collapse. The steel simply weakened. There are no explosions involved. The concrete wasn't turned to dust.
Now as an analogy look at this posterior. It is certainly not an elbow and has no characteristics of an elbow.
http://web1.d25.k12.id.us/home/hhs/sportsmed/elbow%201.gif

Now as an analogy look at this posterior. It is certainly not an elbow and has no characteristics of an elbow.
http://web1.d25.k12.id.us/home/hhs/sportsmed/elbow%201.gif
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