Could the "spire"--that part of the north tower left standing 20 seconds or so after the "global collapse" of the tower around it--have collapsed with gravity the only energy provider...no meddling from "other parties"?
Put another way: I have been looking for a non-human intervention mechanism of collapse for the spire. It's behavior, as seen on the CNN, ABC and Fox News video clips shows unusual behavior if one thinks about it a minute. It appears to get wobbly or soft and slink straight down to the ground. This has been seen as evidence of DEW's used but late firing explosives could also have caused this behavior. Could this behavior, however, have simply been caused by gravity, as we have been lead to believe? I think the demise of the spire--which was not hit by an aircraft and was not subject to fire or any other "softening" agent (or so we've been repeatedly assured by the fedreal agencies tasked with discovering how the WTC buildings collapsed) and that has been relieved of the weight it was designed to support....all the floors sripped from it as it stood there after the dust cleared...odd.
Such a structure could topple, or buckle in either mode 1 (bend over from the top (unlikely but possible)) or mode 2 (bulge out from the center (less likely)) but should not have fallen straight down as though the earth opened up under it or it had been melted from the bottom by fast acting acid.
Actually, as we look at it in the best videos we have of it, it is not a single column but several columns solidly tied together. The top slender section rose above the several columns below. This made for a strong structure. It stood 20 seconds and I think it should have stood for 20 years...or 200 years of the calm clear weather of that morning if left alone to do so.
Does anyone have a natural scenario that could have made the spire collapse as we see it collapse in the videos? Does anyone have an interpretation of the videos that shows it actually toppled or buckled only we couldn't see it do this?...though the images, though not great, certainly show that it goes straight down.
And, last but not least: Where did it land and how do we know? It was possible to identify where pieces of debris in the debris piles came from on the towers from which they fell. Was any of the spire identified on the top of the WTC 1 debris pile where it should have ended up if it really did fall, in pieces (perhaps...delayed explosives every few feet throughout the structure?) after the rest of WTC 1 had fallen?