By the numbers

Total number killed in 9/11/01 attacks: 2,819
Tons of debris removed from site: 1,506,124
Days fires continued to burn after the attack: 99
Jobs lost in New York owing to the attacks: 146,100
Days the New York Stock Exchange was closed: 6
Drop in the Dow Jones average when the NYSE reopened: 684.81
Worldwide insurance costs due to 9/11: $40.2 billion

U.S. military deaths, Afghanistan as of 9/11/09: 824
U.S. military deaths, Iraq as of 9/11/09: 4,343

Total war operations spending since 9/11: $915 billion
($313.1 million/day)

Rise in national debt, September 2001 to September 2009:
From $5.73 trillion to $11.78 trillion (104% increase)

And yet, the true costs to our country can never be quantified.