This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. OMAHA, Neb. (AP) — The federal government ...

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 ...

Are you one of the 300 million people affected by color blindness? Take this simple, doctor-approved test to determine your ...