Global Hawk drone

(Newser) - Today's science vocab lesson: tropopause. It's the atmospheric boundary between the troposphere, where ozone exists as a harmful greenhouse gas, and the higher-up stratosphere, where the same gas plays an important role in protecting the Earth from the sun's UV rays. And that boundary region is about...

(Newser) - The Obama administration has begun sending high-altitude spy drones deep into Mexican territory to keep an eye on the movements of drug traffickers, the New York Times reports. The information is intended to be shared with Mexican law enforcement, and Felipe Calderón formally agreed to the flights in his...