How Santa can find your house in a snow storm

We see you, camera man!
Researchers have discovered that the ultraviolet (UV) light that causes the temporary but painful condition of snow blindness in humans is life-saving for reindeer in the arctic.

Human beings are able to see light with wavelengths ranging from around 700nm, which corresponds to the color red, right through all the colors of the rainbow in sequence to 400nm, which