...explosives in the WTC dust? No PhD has debunked this only an ex tour guide tried to say it was paint but this was proven false in the peer reviewed paper because the paint on the WTC doesnt explode at high temperatures.
http://www.bentham-open.org/pages/content.php?TOCPJ/2009/00000002/00000001/7TOCPJ.SGM
http://www.bentham-open.org/pages/content.php?TOCPJ/2009/00000002/00000001/7TOCPJ.SGM