Hide and Seek in the Dark

Have you ever played Hide-and-Go-Seek in the dark? What about flashlight tag? Or the grownup version of these childhood games: trying to find candles or flashlights in the midst of a sudden power outage. Sight begins when light enters the eye. This light triggers light-sensitive cells in the retina at the back of the eye. As a result, signals zoom along the optic nerve to the brain. The brain then makes sense of the signals, giving us the experience of seeing. When you’re fu...