9/11 conspiracy theorists

I still have one question that I have yet to see a good explanation for...

What happened to WTC7 and why did it collapse?

From everything that I have seen or heard so far, there is no good explanation as to why it did collapse. Does anyone know of a good credible link to any information as to the physics behind it? I really would love to know what happened.

This is all I got
YouTube - 9/11 HISTORY CHANNEL WTC7
 
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