september 11

They were the first at the scene on 9/11. Twenty years later, they're helping us learn the long-term health consequences.

After centuries of silent designs, architects are designing for the ear, too.

Molten aluminum mixing with water could have ultimately brought the towers down

Scientists produce five clones of a dog that assisted with 9/11 search and rescue, and died in April

Toxin sniffers, missile jammers, dirty-bomb detectors: Will a new security arsenal make us safer?

Missile-jamming lasers and “refuse to crash” software are ready to fly on civilian aircraft