By common sense (to those conveniently blinded by government propaganda)

Ten bus piled up to form a tower. (each represent 10 floors of WTC) The second one to the top had a fire. Will the whole tower collapse? For common sense, the bottom eight won't be affected. Because the construction was designed to bear more weight then 100 floors of building.

Yet it collapsed like a free fall. (One demolished in 10 seconds and the other one in 10.5 seconds)

If you play building blocks and pile up a 100 floor tower. What will happen if you take away the blocks at the corner of 83th floor? (One building of WTC was hit at the corner) It will collapse to the side where one corner is missing. (Suppose everything went on as government said that fire melt the iron beam.)

Yet, the building demolished like a free fall in straight way. Beware that from the beginning when the building were hit by plane, the construction structure kept in straight way and supported the whole without any shaking.)

It was a fire getting smaller and off. Unlike other fire which got bigger and bigger because other burning material added in to help increasing fire (like a wooden house), the WTC fire got smaller and off when the fuel burned out. There was no additional burning material to join. Iron beam won't burn. So after ten to twenty minutes when the flame was off, the temperature should decline. How could the building collapse one hour later?

There were two camp fires to boil the water. One was a wood burning fire with wood continually adding in. (normal fire ) One hour later, the water boiled.
The other one was a bowl of gas as burning material. After twenty minutes, the fire was off because there was no more burning material. one hour later, what do you think of the the water? boiled or cooled?

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If Feds call you and defame my message, it is a tactic of intimidation. They don't want people know the fact.
It also proves what I wrote are truth. They are afraid of it.