You have mentioned an amazing thing, that I've been studying the WTC dust for so long and end up finding some 25 feet from my kitchen.
Think about it this way: When I was in graduate school, I had an entire year that did not produce results. 1996. I'm okay with it now, but it was frustrating at the time. I had to overcome some technical hurdles, and eventually I did, and things went smoothly after that.
One of the things I needed to obtain for my PhD thesis, and all the biological work I've done since then, are SAMPLES.
With respect to 9/11, I went to Ground Zero less than 3 days after the attacks, searching for samples. And all the people I've met since then whose homes got invaded by the dust or who survived the dust cloud, I ask them if they saved any of the dust. Every single time, they said no. They said they wanted to get rid of it, took showers, threw away their clothes, and in some cases
they never went back to their apartments once they escaped!
8+ years passed. I did not stop my research. When I moved into the apartments, I wondered to myself if I was going to find some of the dust, and years later, I did. You could call it "luck" but there are things that weren't lucky that contributed to me finding these samples.
I insisted on living close to Ground Zero. Nothing could keep me away. I lived where I lived because in large part I am a 9/11 researcher. Another things is that I was prepared to succeed. I know my stuff. Not only are there many pictures online of the WTC dust, but I also saw it with my own eyes on concrete ledges. Went I went to Ground Zero, I saw the dust up on second story ledges and wished I could reach it. I saw what the dust looks like when it was deposited on concrete ledges, and that led me to recognize what I was seeing in a way that someone who hadn't prepared themselves perhaps would not have.
Only a 9/11 researcher would look at that "dirt pile" and know that it was WTC dust, and most 9/11 researchers would have failed, too, because the theories they are working on do not produce this type of dust. Explosive devices produce chunks of buildings when they are used to demolish buildings. Anyone who thinks explosives destroyed the WTC would have failed to recognize the dust for what it was.
Anther way I was prepared was the year 1996. The year of no samples. I know what it is like to work away on something without the physical object in hand. Me finding the dust all those years later is testimony to my extreme patience and determination.
I think it's rather an amazing serendipity that the smoking gun that will finally crack the mystery of 9/11 just happened to turn up in the residence of the top 9/11 investigator in the world. I mean, what are the chances???