It goes back far enough that militaries have developed weapons intended to overwhelm enemies and shift the balance of power on the battlefield. But some of these innovations proved so destructive or ...

The gas, ethylene oxide, plays a crucial role in sterilizing medical devices. But long-term exposure is linked to several ...

A new study shows extreme heat is increasing worldwide, limiting safe daily activities and raising health risks for millions of people.

Federal agents' heavy use of tear gas is raising concern about harmful effects to protestors and neighborhoods. A toxicologist explains what it is and its health effects.