Claim: Jim Hoffman’s “9/11 progressive collapse challenge” can’t be met

THE PROGRESSIVE COLLAPSE CHALLENGE

The challenge is in 5 parts, from the easiest to the most difficult.

All five require building a structure that will undergo top-down progressive total collapse — i.e.: when disturbed near the top, it will collapse from the top down to the bottom, leaving no part standing. The disturbance can include mechanical force, such as projectile impacts, and fires, augmented with hydrocarbon fuels. Explosives and electromagnetic energy beams are not permitted.

Your structure can be made out of anything: straws ... Read even more

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