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Summer sunshine makes most of us feel better, but there may be more to the benefits than just feeling good. A growing body of evidence suggests sunlight itself – with adequate protection, of course – may actually be good for health. Sunlight comprises two types of solar radiation: UVA, which causes reddening and burning of the skin, and UVB. The latter increases the production of an inactive form or precursor of vitamin D by the skin, which is then activated by the liver and kidneys. Unfortunately, both UVA and UVB also increase the risk of skin cancer, including the most deadly type, melanoma, which is why you should always take a balanced approach to sunlight exposure. ....