UV rays

With daylight a little less plentiful each day in the Northern Hemisphere until the Winter Solstice arrives, some sun worshippers are scrambling to maintain their precious, but fading, tans.

Have you ever heard someone (OK, your mom) say, "Don't sit too close to the TV, you'll hurt your eyes!" or "Don't read in the dark, you'll strain your eyes!" and "Eating carrots will improve your vision!"  Are