Reply #12: You may also find this scientific research interesting

[Dancing_Dave]

One of the very first scientific studies of WTC explosive debris (dust) done from an environmental/public health concern point of view:
http://ehp.niehs.nih.gov/members/2002/110p703-714lioy/lioy-full.html

They even thought to identify radionuclides by the their quantum emission spectrum, and identified Uranium, Actinium and Thorium. That should get you thinking.

To put this in the context of the broader official 9/11 cover-up, Joel Kupferman's "The Public Health Fallout from September 11: Official Deception and Long Term Damage" will be helpful:
http://www.nyenvirolaw.org/PDF/Kupferman-Chapter-in-LOST-LIBERTIES.pdf