Sergeant Major of the Marine Corps Carlos Ruiz is 50 and still trains with Marines worldwide. Here's how he trains to stay mission-ready.

Good dieting and nourishment are essential to keeping up with in general prosperity and forestalling persistent illnesses. By picking supplement thick food sources, people can

The closer to Earth a satellite flies, the clearer a picture it can take of the surface. But low-flying satellites also have to deal with atmospheric drag.