A Moment of Science
Scientists tested eighteen reindeer with light, and found that their eyes responded to both visible light and ultraviolet.
When we are in a fairly dark room, or outside at night away from lights, we can still see, but we can't see the colors of things very well. Why is that?
Ever notice how a little cologne can be attractive, but too much is totally repellent? That principle is used by cycads, an ancient type of cone-bearing tree.
With three simple ingredients, a red, a green, and a blue spotlight, you can make any color of the rainbow. Learn more on this Moment of Science.
The back of your eye, called the retina, has two kinds of cells: rods and cones. In bright light the cones are what we use, while in dim light the cones are less active and the rods take over.
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