Actually, you amy be onto something. It is no accident that the color of one's skin is inversely proportional to the distance one's ancestors lived from the equator.
"the color of one's skin is inversely proportional to the distance...from the equator."
Your right, it is no accident. Vitamin D is created in the oils on the skin and absorbed into the body where it is essential for bone formation, and perhaps antidepressive effects. Women deficient in Vitamin E form norrow pelvic girdles, which make childbirth difficult. A person suffering from Rickets (Vitamin D deficiency) will have thick wrists and a bulging skull. Thus the entusiasm for blond women and graceful wrists. This mutation away from the heavy melanism of the tropics probably made it possible for homo sapiens to migrate into ice age Europe, and sucessfully bear young.