This is an excellent documentary done by Architects, Engineers and scientists, specifically Physicists. It is well worth showing to people who believe that on 911 the buildings fell down due to being hit by planes. This in-depth documentary shows you the pure physics and engineering which indicates that these buildings were blown up.

Related books:-
Solving 9-11: The Deception That Changed the World – by Christopher Bollyn – http://amzn.to/2gvp4PU
Solving 9-11: The Original Articles – by Christopher Bollyn – http://amzn.to/2gvwjY1