A brouhaha broke out recently when it was revealed that TED treated a talk on color blindness by Coleman Hughes (who is black, if that matters), with surprising levels of hostility. Mr. Hughes and TED ...

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 ...

Women can be colorblind, but it’s much less common than in men. Red-green color blindness, the most common type, is inherited through the X chromosome. Since males have only one X, they need just one ...