It's in general, as it has to do with 9/11: http://news.yahoo.com/twin-tower-collapse-model-could-squash-9-11-201204097.html?cache=clear This isn't conspiracy, but rather, answers from science (physics and chemistry) explaining all the conspiratorial objections (subfloor explosions, molten metal, etc.) to Occam's Razor that it was just two planes crashing into the towers. I think he does a good job of answering the questions. I'm neither a physicist nor a chemist, but as a welder, it makes perfect sense to me. If this isn't the place for rational, scientific explanations, feel free to move this elsewhere.