Geckos Don’t Need Flashlights

You get up early. The illumination isn’t very good, you put on your socks anyway, only to find out, in the light of day, that you have one blue and one gray sock on. That’s because our eyes have cone cells to detect color, as well as rod cells that are sensitive to light, but cannot see color.

Photo: Gecko (not the hooded gecko). (PD)