Steve Jones and his physics analysis of 9/11...

[Chriszuma]

It's like puncturing a screen window with a pencil - it puts a hole in it but it doesn't destroy the entire screen.

I'm with Ken on this one. Whoever says it was like a pencil is blind. A more fitting analogy would be if you hit your screen door with an axe, and then torched it with a flame thrower. There's no telling what might happen.