World Book Enclyclopedia ,2000. 5. The color of hair is determined largely by the amount and distribution of a brown-black pigment called melanin. Hair also contains a yellow-red pigment that is most visible in people whose hair has little melanin. Most people's hair gradually becomes gray or white as they grow older, because pigment no longer forms. World Book Encyclopedia , 2000.
Eye color comes from melanin.
The more there is and the closer it is to the surface of the iris, the darker the color of the iris. World Book Encyclopedia , 2000. England , states that the British way of riding on the left side of the road is a carryover from the days when men rode horseback and used swords. In a combat situation, the sword was drawn from the left side and wielded on the right. Apparently, when automobiles were invented, the custom of staying on the left persisted.