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Maybe you guys havent got it yet.
How close to melting point does steel have to get before it begins to weaken? How much extra stress was added just by the numerous outer supports that were lost in the plane collision? If you add those two factors together what do you think will happen? The inner support columns losing strength due to the heat, and the thousands of tons of weight above pressing down. Then the missing columns from the crash. What did you think would happen really?
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