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Wind speeds at that altitude on that day, combined with the fire from the burning fuel, caused the steal to melt to a point where the structure could no longer hold the weight of the material above.
I saw that building go down, the "explosions" in the video were debunked as nothing more than pressure releases from material being broken apart quickly.
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Steel does not have to have to melt to be structurally weakened. The burning fires heated the steel up so much that it lost it's strength and became weak. It did not melt it broke.
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Maybe its just me but after watching this video its pretty clear that the Steel didnt break it melted, and considering that steel only "melts" at 2500 degrees Fahrenheit its ovious that thermite or some other type of demolition device was used.