I detect a healthy note of doubt. Nice thread. This page will clear up some issues.
http://algoxy.com/psych/9-11corexplosions.html
Combined with this page.
http://algoxy.com/conc/core.html
It should be fairly obvious that not only was there a concrete core, but what we saw could only happen with a concrete core.
Actually I wasn't doubtful at all, I just have never really asked questions about the core before and it is good to know that they didn't have a concrete covering.
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About the websites you posted...
I read through them, and neither one of them have convinced me.
This picture here seems like more and more BS each time I see it:
How is that obviously a concrete core? It's taken from the side, there could easily be other debris a parts of the building stuck in the cracks of the core after the collapse just making it appear that way. No other pictures I've seen show a concrete core.
Look here, this is the South Tower core standing at the beginning of the collapse:
It looks nothing like the hump that appeared at the base of the collapse with a rounded top. It's obvious that falling debris distorted the core and made it appear differently.
These are pictures of the cores:
This is an interesting picture, it shows how the core could appear to be a completely solid object with no holes or cracks in it, especially from hundreds of feet away, yet there's no concrete visible even from only a few feet away:
This picture says a lot, where's the concrete? You can pretty much look right through the building:
Where's the concrete in these:
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So...you have one picture from hundreds of feet away from the collapse that makes the core appear to be concrete, and that somehow proves all of these pictures false, and proves that the buildings had concrete coverings on their cores?