Why are Alaska’s rivers turning bright orange? Scientists have a theory.

The dramatic shift is a warning sign—and scientists say the changes that aren't yet visible to the naked eye are just as troubling.
Beyond Walks on MSN

Soldier POV of Firing .50 Caliber Machine Gun

A first person view of Spc. John Brunner, an infantryman with Delaware Co., 1st Battalion (Airborne), 501st Infantry Regiment, 4th Infantry Brigade Combat Team (Airborne), 25th Infantry Division, ...