The Northern Lights put up quite the show in the Netherlands last night, and the internet is flooding with pictures of green ...

The deadliest attack submarines in the U.S. Navy thrive in the darkness of the ocean's depths, but every once in a while they need to rise to periscope depth so the crew can get a lay of the land.

If you have ever closely observed a helicopter, you must have noticed the red and green lights. In fact, these lights are not only present on helicopters but also on commercial and private airplanes.