<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
Why does the sun make our hair lighter but make our skin darker?
<|assistant|>
The sun makes our hair lighter because melanin does not absorb all of the sun's ultraviolet radiation, which is responsible for hair lightening. On the other hand, the sun's ultraviolet radiation is absorbed by the top layer of skin, which darkens and gets wrinkled in older individuals. Therefore, even though the skin is exposed to the sun’s radiation, it does not become lighter like hair does due to the fact that the sun's ultraviolet radiation is not present in sufficient enough quantities in order for this to happen. Additionally, the deeper layers of skin which contain pigmentation are unaffected and remain the same color. Thus, our skin darkens when it is exposed to the sun.