Attention sunscreen skeptics: The sun’s UV rays are coming for you, and you’re just making their job easier. Summer is now upon us, which means more time in the sun—and more exposure to the ultraviolet radiation it emits. Longer-wavelength ultraviolet A rays can reach beneath the skin’s surface, causing it to age prematurely. Shorter-wavelength ultraviolet B rays affect the outermost layers of skin, causing sunburns and tans. (A third type of rays, ultraviolet C, is intercepted by Earth’s protective ozone layer.) Both UVA and UVB damage the DNA in skin Read More