Scientists have known that there is a difference between the sun’s visible radiation and invisible ultraviolet radiation from the sun. Ultraviolet radiation is separated into 3 types: UVA, UVB, and UVC. The scientists in this study were interested in trees growing in urban areas. They wanted to know whether the shade that we can see under urban trees protects people from UVB radiation. Note: In earlier Natural Inquirer articles like this one, the Discussion section is called “Implications.” Topics: Active Forest Management, Reflectivity, Shade, Urban trees, UVA Radiation, UVB Radiation.