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.

Daniel Freedman does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...

“Both green apples and red apples are healthy, and the choice comes down to taste preference,” says Manaker. If you prefer a ...

Modern shipping makes use of all manner of relatively new technologies, from using GPS for navigation to building dual-fuel engines in a bid to cut down on emissions. However, a number of key shipping ...