The initial numbers are indelible: 8:46 a.m. and 9:02 a.m. Time the burning towers stood: 56 minutes and 102 minutes. Time they took to fall: 12 seconds. From there, they ripple out.

• Total number killed in attacks (official figure as of 9/5/02): 2,819
• Number of firefighters and paramedics killed: 343
• Number of NYPD officers: 23
• Number of Port Authority police officers: 37
• Number of WTC companies that lost people: 60
• Number of employees who died in Tower One: 1,402
• Number of employees who died in Tower Two: 614
• Number of employees lost at Cantor Fitzgerald: 658
• Number of U.S. troops killed in Operation Enduring Freedom: 22
• Number of nations whose citizens were killed in attacks: 115
• Ratio of men to women who died: 3:1
• Age of the greatest number who died: between 35 and 39
• Bodies found "intact": 289
• Body parts found: 19,858
• Number of families who got no remains: 1,717
• Estimated units of blood donated to the New York Blood Center: 36,000
• Total units of donated blood actually used: 258
• Number of people who lost a spouse or partner in the attacks: 1,609
• Estimated number of children who lost a parent: 3,051
• Percentage of Americans who knew someone hurt or killed in the attacks: 20
• FDNY retirements, January–July 2001: 274
• FDNY retirements, January–July 2002: 661
• Number of firefighters on leave for respiratory problems by January 2002: 300
• Number of funerals attended by Rudy Giuliani in 2001: 200
• Number of FDNY vehicles destroyed: 98
• 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
• Point drop in the Dow Jones industrial average when the NYSE reopened: 684.81
• Days after 9/11 that the U.S. began bombing Afghanistan: 26
• Total number of hate crimes reported to the Council on American-Islamic Relations nationwide since 9/11: 1,714
• Economic loss to New York in month following the attacks: $105 billion
• Estimated cost of cleanup: $600 million
• Total FEMA money spent on the emergency: $970 million
• Estimated amount donated to 9/11 charities: $1.4 billion
• Estimated amount of insurance paid worldwide related to 9/11: $40.2 billion
• Estimated amount of money needed to overhaul lower-Manhattan subways: $7.5 billion
• Amount of money recently granted by U.S. government to overhaul lower-Manhattan subways: $4.55 billion
• Estimated amount of money raised for funds dedicated to NYPD and FDNY families: $500 million
• Percentage of total charity money raised going to FDNY and NYPD families: 25
• Average benefit already received by each FDNY and NYPD widow: $1 million
• Percentage increase in law-school applications from 2001 to 2002: 17.9
• Percentage increase in Peace Corps applications from 2001 to 2002: 40
• Percentage increase in CIA applications from 2001 to 2002: 50
• Number of songs Clear Channel Radio considered "inappropriate" to play after 9/11: 150
• Number of mentions of 9/11 at the Oscars: 26
• Apartments in lower Manhattan eligible for asbestos cleanup: 30,000
• Number of apartments whose residents have requested cleanup and testing: 4,110
• Number of Americans who changed their 2001 holiday-travel plans from plane to train or car: 1.4 million
• Estimated number of New Yorkers suffering from post-traumatic-stress disorder as a result of 9/11: 422,000