Ten years later, what exactly residents and rescue workers were exposed to remains at least a partial mystery
From hacking infrastructure to a detonating a nuclear "dirty bomb," what are the most likely next terrorist attacks?
A look at how much the U.S. has spent through Homeland Security since 9/11 and what the government spends on preventing deaths through public health
Twin Towers Forensic Investigation Helps Revise Building Codes, Despite Critics
Federal disaster investigators issued 31 recommendations to improve the safety of high-rises and emergency responses, but critics emerged
Direct Response: 5 Pre-9/11 Security Breaches and the Safety Measures That Followed
Long before 2001 authorities were scrambling to respond to deadly attacks of all kinds
The Changing Mental Health Aftermath of 9/11--Psychological "First Aid" Gains Favor over Debriefings
Our understanding of how people experience trauma--and how best to help them recover from it--has changed greatly in the past decade
Shaping Up: 10 Engineering and Design Facts about One World Trade Center [Infographic]
What was once called the Freedom Tower should soon become the tallest building in the U.S. It will also be among the best prepared in the nation for a terrorist attack or other emergency...
The Apple of Its Eye: Security and Surveillance Pervades Post-9/11 New York City [Video]
The Lower Manhattan Security Initiative has covered much of the city with a network of surveillance cameras and other equipment, to the dismay of privacy advocates
Yes We Scan: Have Post-9/11 Airport Screening Technologies Made Us Safer? [Slide Show]
Airport security breaches on and after 9/11 have led to the continual advancement of technologies such as millimeter wave imaging and backscatter scanners to prevent future tragedies
How Young Children Learn about Terrorism and 9/11
What have we learned about the way children understand and process major events--even if they, themselves were not alive to have experienced them?
How Accurate Are Memories of 9/11?
Recollections of the circumstances of how we first heard of the 2001 terrorist attacks may feel extraordinarily vivid and true, but they are flawed
Commemorative Calculus: How an Algorithm Helped Arrange the Names on the 9/11 Memorial
Underlying the memorial's seemingly random layout of nearly 3,000 names is a complex and deeply human order
Post-9/11 Technology Brings Exoskeletons, Laser Cannons to 21st-Century U.S. Military [Slide Show]
The U.S. Department of Defense keeps seeking and developing advantages for today's unconventional warfare, ranging from Iron Man-like body suits to smart grenade launchers
Science after 9/11: How Research Was Changed by the September 11 Terrorist Attacks
New work in forensics, biodefense and cyber security blossomed after the attacks on New York City, Washington, D.C., and in the skies over Pennsylvania, but increased regulations have also stymied international collaboration as well as work on some infectious diseases...
The Drone Wars: 9/11-Inspired Combat Leans Heavily on Robot Aircraft
The U.S. Defense Department has added thousands of automated aircraft added to its fleet over the past decade to support operations in Afghanistan, Iraq and Pakistan as concerns of drone accuracy persist...
Did the U.S. Overreact to the 9/11 Attacks? Undoubtedly
Forgetting About 9/11
How the Brain Remembers 9/11
The Unkempt Results of Post-9/11 Airport Security Rules
A humorous review of the "illusion of safety" airport security brings—along with the lack of personal hygiene products