The UV Index (UVI) is a number that tells you how strong the sun’s ultraviolet (UV) rays are on a given day. These rays are invisible, but they can damage your skin and eyes. The UV Index was ...

color in the ultraviolet range. Examining snakes, the researchers categorized how the animals used patterns of UV color and tested for factors that promote the evolution of UV color in snakes.

The only way to boost melanin production is to expose your skin to UV rays, which comes with risks. Melanin is a natural pigment in the human body that gives hair, skin, and eyes their color.