Comment: this would be a valuable calculation

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this would be a valuable calculation

In the case of the three and four ton pieces of steel ejected at 50-70mph and embedded in buildings across the street, to how many atmospheres must air be compressed to approach the explosive force of gunpowder? Is it even possible to compress air this much in the absence of airtight metallurgy? For people who don't understand intuitively that even when a building is crashing, air does not lift and propel 4 ton beams.

photo of beams embedded into buildings at slide 405:

A man who views the world the same at fifty as he did at twenty has wasted thirty years of his life.
-- Muhammad Ali