"The first key to wisdom is constant and frequent questioning, for by doubting we are led to question and by questioning we arrive at the truth." - Peter Abelard
Here are your keys.
Journal of 9/11 Studies A peer-reviewed academic journal, covering the whole of research related to the events of 11 September, 2001. Many fields of study are represented in the journal, including Engineering, Physics, Chemistry, Mathematics and Psychology. They have a Beginner's Guide to get you started.
Architects and Engineers for 9/11 Truth An organization of architects and engineers dedicated to researching, compiling, and disseminating scientific evidence relative to the destruction of the three World Trade Center skyscrapers. They call for a truly open and independent investigation and support others in the pursuit of justice.
9/11truth.org Touted as the leading portal of the September 11th research community and truth movement, this database has it all. If it's related to 9/11, it's covered here. Check out their Top 40 Reasons to Doubt the Official Story of 9/11.
Truth Action Forum A forum for the 9/11 Truth community. Thousands of posts by average truth-seekers just like you. Also features an Action Center detailing how citizens' influence can bring real change and transparency until the truth is made known.
Center for Research on Globalization has a massive database full of news and articles on 9/11 evidence and the effects of US policy made from the incomplete investigation.