Smoke billows up from the ground after one of the towers of the twin towers of the World Trade Center towers collapsed 11 September, 2001 in New York.(credit: HENNY RAY ABRAMS/AFP/Getty Images)
Richard Clarke put together this scathing essay on what has happened since 9/11. He was a national security chief and he thinks a lot was done poorly. Read the essay. Also, new audio discovered from attacks on 9/11.