I did not know that a 47 story building that was NOT hit by a plane on 9/11 fell down into its own footprint until about 6 months ago.
I used to laugh at the conspiracy nuts until I learned about Architects and Engineers for 9/11 Truth. Here Richard Gage (20+ year experienced engineer) discusses the facts regarding Building 7. The facts are now clear to me, 9/11 was a controlled demolition.
http://www.ae911truth.org/