Simple enough. But what happens when you live in a culture where green also means blue? (Before we answer that, here's why our own traffic light colors are red, yellow, and green.) That’s when ...

A mysterious spiraling blue light illuminated the night skies over Europe on Monday. The cosmic whirlpool was captured in stunning video and appears to have been created by the SpaceX Falcon 9 ...

It absorbed red and blue wavelengths but allowed the green light to pass. Consequently, the oceans wore a green hue and if cameras existed, Earth would have looked emerald green from up above.

Nick first sees Gatsby stretching his arms towards a green light at the end of Daisy's dock. Here, the green light is a symbol of hope. After meeting up with Daisy in chapter five, the light ...