He looks dull to the naked eye, but under the right light he shines. Literally. A team of interdisciplinary researchers discovered it by shining an ultraviolet light on this little frog man and observing his glow. They published their results on Monday in Proceedings of the National Academy of Sciences. Right now you're probably thinking "a glow-in-the-dark frog—cool!" but you're wrong so stop it. He doesn't glow in the dark, he fluoresces, which is a whole other thing. Glow-in-the-dark things, like those stars you had on your ceiling as a kid or the bouncy ball you won at an arcade, work through phosphorescence. Phosphorescent materials get energized by a light source, often by natural sunlight, and then emit the energy back out over a long period of time. Thus, they glow in the dark even after you take away the light source. After a while, though, they'll lose their charge and go dark.