Plumage and body parts of birds-of-paradise glow in certain areas when viewed under blue and ultraviolet, or UV, light, ...
Certain advanced technologies, such as 3D displays, biosensing, and security printing, can utilize circularly polarized ...
In some people that are photosensitive, UV light from sunlight and indoor light sources can trigger a lupus flare. In addition to sunlight, ultraviolet rays are also given off by several different ...
From there, your only job is to keep a close eye on the spot's color. A light purple spot means your skin is partially protected from harmful UV rays. A dark purple spot means it's time to reapply ...