Scientists say they have discovered a new colour only ever seen by five people in the world - called ‘olo’. The colour, said to be a saturated shade of blue-green, cannot be seen by the naked eye ...

Dr. Mark Lindsay was 5 years old when he first learned that tree trunks were brown. "Up until that point, I believed leaves and trunks were all green. Just lighter and darker shades," Mark said. Mark ...

Is your green my green? Probably not. What appears as pure green to me is likely to look a bit yellowish or bluish to you. This is because visual systems vary from person to person. Moreover, an ...