Wes Felter

Wes Felter says: “I didn't understand how they could have collapsed; the buildings didn't look damaged below the crash sites.” NPR interviewed a Berkeley engineering professor, he explained what happened. Basically the steel in the top 20 stories got very hot and softened, and collapsed on the lower 90 stories. They couldn't handle that kind of load, so they collapsed too. [Scripting News]

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