You might have seen traffic lights in Japan that are a little different to what you're used to. Instead of being red, amber, and green, the last light on the signal might be blue, or perhaps an ...

You’re introduced to someone and your attention catches on their eyes. They might be a rich, earthy brown, a pale blue, or the rare green that shifts with every flicker of light. Eyes have a way of ...

Five people have witnessed an intense green-blue colour that has never been seen by humans before, thanks to a device that might one day enable those with a type of colour blindness to experience ...