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No credible is people who say they heard "explosions." Honestly, I can't tell the difference between a car backfiring and certain types of gunshots.
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By happenstance, the vid also shows
some of the flashes that were observed, and, of course, the implosion of the building(s) itself. It is hard for me to believe that anyone could watch these buildings come apart as they did and mentally map it to a gravity collapse. Even without understanding the structural theory of the building. It is even more ridiculous when one does understand the core columns and such.
BTW, here's a rather well known photo of one of the core columns:
It
appears to show the effects of thermate used in a conventional manner, and from the research I did (a long time ago) the picture was taken at a time when this cannot be explained by after-action clean-up efforts.
I would also point out the absurdity of an aluminium aircraft 'taking out' not one but many such columns in the center of the building. This after taking out the much smaller but still very substantial steel structure which provided strength to the outer part of the building. Ever see how an aircraft is built?
"Rather well know photo" only shows a column cut at a standard angle, either by cutting torches or something like thermite. Most likely just a cutting torch, because that wouldn't require building up the dam like structures around the areas to be worked on. And with thermite, the slag would have been routed out, not just dribbled on the low side. So I'd say cutting torch on this, but could be wrong. Does not matter, because for this picture to support the conspiracy theory you have to definitively show the column to be like that before the men started working.
Because those men arrived to do things — EXACTLY THINGS LIKE THAT.
I'm certain you can see the problem with this kind of "evidence."
As for your question about being doubtful as to the kinetic energy of a plane hitting the tower, we can address that. Have you considered that the kinetic energy of a mass is a function of speed and of weight? It does not matter if the mass is steel, fuel, water, humans, or aluminum. There is nothing but the cross sectional area of the propelled object divided by the weight, times the square of the velocity. Then there are secondary effects if the mass experiences phase changes on impact. (Solid to liquid, or liquid to gas). Whether this occurs is a function of the noted kinetic energy figured as instantaneous localized heating.
As for the flash in the video (one flash repeated over and over) I'm not impressed. Yes, it appears to be a flash in the interior of the building - it looks like a flash from the big UPS systems which were IIRC a couple floors over the area that got hit. So, something shorted out, right? Flash.
What I was getting to is that if thermite had been used on the exterior columns you would have seen a very distinctive series of flashes going down the line. One random flash doesn't cut it, sorry.
Also, are we through arguing nano-thermite? As I mentioned, there's no need to hypothesize "nano-thermite" for a conspiracy theory, in fact it makes it crazier. Demolition crews would simply used standard materials and standard methods. Never has that been "nano-thermite," which is something of a laboratory curiosity. The very reason Nobel won his Nobel prize was the fact that he figured out a way that dangerous, explosive material could be handled safely.
I'm also curious, why this focus among conspiracy nuts on "cutting the columns?" There is no relation between cutting a column and bringing a building down. It is only necessary to heat a steel structure until it is weakened. Steel is like putty when it is above 500-800 F. The temperature and strength curves are well understood. There's plenty of energy in jet fuel to do this. This is simply stated, why I do not think "additional theories" are required. These theories only attempt to bring "additional destructive energies" into the equation. But if the known energies are sufficient, these ideas are not necessary.
It's as simple as that. The conspiracy theorist must first rule out that the impact energy and the fuel of the jets could have caused the structural failures.
I have not seen this done. I've seen attempts at it that were extremely easy to debunk.