In a new study in Biology Letters, researchers show that humidity can temporarily change the color of a North American sweat ...

Eye color is shaped by a complex interplay of genetics, microscopic iris structure, and the way light scatters within the eye. While lighting, pupil size, and clothing can make eyes appear to change ...

Warlocks, are you tired of your demons looking a little... dull? Does the hellfire in your pets' eyes just not have the spark ...