There are loads of 9-11 documentaries out there, giving theories on what really happened. But there is a series of documentaries I have only just come across, that give the most fact and evidence based view on what really happened. They support the work of Dr Judy Wood, who after my research, I have found to be the only person who has collected actual evidence, and when looked at, at a whole, is the most credible reason. The series is called 9-11 Alchemy and there are 3 chapters to check out. The links below are for each documentary, over on Math Easy Solutions You Tube Page.