And with the US dropping to its lowest ranking ever in the World Happiness Report, Americans can use any help they can get in ...

Our world is one of green forests, blue skies and glowing orange sunsets ... key to seeing it as yellow, as Hurlbert explains during a striking demonstration in Living Colour.

The colour of an object is determined by the ... white light into a spectrum of colours: red, orange, yellow, green, blue, indigo and violet. Dispersed means that the colours are separated out.