Abstract: There are several reasons why a large proportion of the public is resistant to looking at the scientific evidence that explosives were used in the demolition of three buildings at the World Trade Centre on the 11th of Sept 2001. The reason for some is that they do not trust their own calculations, or find calculations tedious, and instead rely on a trusted authority. The purpose of this paper is to provide an argument that explosives were used which does not require any calculation. The hope is that readers will be curious to see how this can be done and will read on and discover, perhaps with some surprise, that they are able to rely on their own judgment. The argument is based on material readily available for all to study, namely videos and photographs.
The manner of collapse of the buildings at the World Trade Centre (WTC), which came down on the 11th of September 2001, has been discussed many times. Those who dispute the official explanation for the collapses frequently base their case on the fact that all three buildings, the twin towers (WTC 1 and WTC 2) and building 7 (WTC 7), came down too fast to be explainable by fire and impact damage alone. This is used as evidence that the support structures were somehow rapidly destroyed, and calculations are provided to show that the rate of collapse was indeed too fast, close to free fall. The calculations are usually followed by discussion about the appearance of the collapse, in particular its verticality, as a means of providing support to the calculations.
The intention of this paper is to totally avoid calculations and to provide a proof of explosives based only on the appearance of the collapse of WTC 7. This building came down about seven hours after the Twin Towers. The fact that it collapsed without having been hit by a plane briefly raised doubt about what had caused the collapse of the towers but this doubt was quickly forgotten in the media barrage supporting the official fire theory.
Many people are unaware that a third building came down that day as videos have rarely been shown, even though the collapse was, on the face of it, virtually inexplicable, and should therefore have generated substantial media attention.
