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If John Kerry says it, it must be true. :rotflmbo:
If John Kerry says it, it must be true. :rotflmbo:
I won't take a position on 9/11 but I know for sure that buildings CAN pancake at freefall speeds into their own footprint - I've seen it happen in person, and it took a lot less than a fiery plane crash with enough heat to explode concrete like shale tossed into a fire, and make steel soft as butter (I also do blacksmithing - you don't melt the stuff!). All it took was building it a little too fast - pouring the next floor's concrete a few hours too quickly after the floor below.
The safety factor for a skyscraper is like that of an airplane, not like that of a digger. Go check. They're not all that safe, if they were, they'd simply add more stories till they had that tiny factor again - ask any pro architect, including the one who designed those.
Try this experiment. Set a hammer head on your thumb. Doesn't hurt, right? Now drop 3-weight of them on your thumb from a story high. Different result?