[chimpburger]

WTC7, a solid steel 47-story building, spontaneously disintegrated and collapsed symmetrically into its footprint at near free-fall speed. This was due to small fires on the ground level, not the government.

EDIT: small fires at ground level have caused perfect symmetric demolitions of many skyscrapers since WTC7. This is why small fires are now the preferred method of demolition.

[freejulian85]

Cute, but the actual science suggests otherwise: http://ine.uaf.edu/wtc7