A device has enabled people to see a new a shade of blue-green, which they say is more intense than any experienced before ...

Just when you think you've seen it all, researchers claim to have developed a way for people to see a color the human eye has previously never seen before. They're calling this new shade 'Olo.

A team of scientists in California say they have discovered a new color they named olo, but you can't see the "most intense teal" with the naked eye.