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Perfect skin

发布时间:2019-03-07 04:04:08来源:未知点击:

By Nicola Jones BLACK skin could be better than white skin at protecting against disease, according to an Australian researcher. This enhanced immunity could explain why dark skin evolved in humans and animals living in tropical climes. No one knows why darker skin prevailed in some areas and lighter skin in others. A popular theory is that the extra melanin in darker skin protects against cancer and sunburn from ultraviolet radiation. But some parts of the body which are hardly ever exposed to sunlight, such as genitalia, throats and nasal passages,