A frequent argument is that the collapse of the WTC towers was at free-fall speed, and this mean no resistance, so all the columns must have been destroyed. But how many explosives would this theory entail? How would they be set off? Some figures: WTC1/2 each had 110 floor, 46 core columns. Does this mean that there were 2*46*110 = 9200 explosive charges installed in the towers? How were they set off with such incredible precision? 9,200 individual radio controlled detonators? 9,200 digital timers? Lots of wire? What about the exterior columns? Wouldn't the also have to be destroyed to ensure near-free fall speed, according to AE911? Each side had 20 three column sections. How many need to be cut to remove all the resistance? That's 3*20*4*2*110 = another 52,800 individual column segments. How many were cut? And what was used to cut them? Thermite burns too slow, thermate does a better job, but not really, but it's noisy and toxic, regular explosives are noisy. What would your proposed quantity weigh? 10 lb per column? 50? A pound or so for the radio and battery? Any wires? That's at least 100,000 pounds just to wire all the core columns. And if you are using thermate you'll probably need at 50 pound rig per column based on Johnathon Cole's experiments. So really we are talking about 1,000,000 pounds of explosive and gear. Truthers, what do you think is the smallest amount of explosives, the smallest number, and how would they be installed? In addition, the number of explosives affects the detonation method. One can quite easily rig a bomb to go off with a cell phone, however even this single bomb setup has problems, as most cell phones do not have more than a few days of battery life. A very large number of cell phones is not practical. Remote detonation by radio is problematic, but seems at least technically possible. In order to avoid accidental triggering, the detonation device must have a receiver that is activated by a code, and then separately activates the detonator, possibly with a timer. But then you've got the problem of having 10,000 custom coded detonation devices, and their batteries. 100% detonation would be highly unlikely, leaving a lot of evidence. What's your proposed method?