Did you know that of the entire world's population, only 1-2% have red hair?  A person with red hair and blue eyes is the rarest combonation in the world. Redheads require larger doses of anesthesia and are more resistant to pain killers.  Red hair keeps its pigmentation longer so redheads take much longer to go grey than the rest of us!  See all 11 facts you should know about redheads by clicking below: