And this doesn't just happen at congested intersections, it happens everywhere. Now I complain when my brother pulls up practically on the bumper of the car in front at a light, but a couple feet is usually the norm. A car length and a half is STUPID!
Mood necklaces or rings usually contain a chemical that changes color with heat (example cold to warmer black, purple, blue, green, reddish). They then usually have a pamphlet saying what the colors mean.
who ever typed the above is a dork because i just saw the ring around the moon and came in to look it up! Its called a Halo. If you are referring to the ring of light sometimes seen around the Moon, then it is called a halo and is a result of moonlight reflecting and refracting in tiny ice crystals located in clouds or the upper atmosphere.