The Internet Oracle has pondered your question deeply. Your question was:
> Oh Oracle most wise,
>
> Why does the sun lighten our hair, but darkens our skin?
And in response, thus spake the Oracle:
} The darkness to the skin has to come from somewhere! Through a complex
} process, the sunlight shifts the dark from the hair to the surface of
} the skin. This is why really light blonde people don't tan, but burn.
} They have no dark to move.