Stranger Than Fiction: Collapse Load (CL) to Dead Load (DL) Efficiency Testing for Student-Constructed Model Balsa Wooden Trussed Bridges - Bridge Efficiency

Stranger Than Fiction: This Poster Graphic explains Engineering Structure Efficiecy Testing to Collapse or Break.

Most strangely a Balsa Wood Model Student-Constructed Bridge will top-load 4,400 times its own weight before it breaks/collapses.

That is very strange because a Steel WTC Twin Tower can only topload 20 times its own weight before it potentially can collapse. The Bridge's Collapse Efficiency is 220 time more Efficient than the Twin Tower's Efficiency.
That is very, very strange, indeed !!??
Can you explain why Balsa Wood is so very much more collapse Efficient than a Steel Twin Tower.
If you can, then please reply to this puzzlement.

(4,400/20) = (220/1)