The specific cause of Parkinsonâs is unknown; however, medical experts believe the symptoms are related to a chemical imbalance in the brain caused by brain-cell death. Parkinson's disease is chronic (persists over a long period of time), and progressive (symptoms grow worse over time).arkinson's disease (or, simply, Parkinson's or PD) is the most common form of parkinsonism, a group of motor system disorders.
Quick Answer. Non-mandatory ZIP codes were introduced to the United States in 1963. Robert Moon, a postal inspector with the United States Postal Service, proposed the ZIP code system as early as 1944. Continue Reading.
The nine-digit ZIP code is required for all classes of mail. The ALNAV message is available at http://www.public.navy.mil/bupers-npc/reference/messages/Documents/ALNAVS/ALN2013/ALN13047.txt. ZIP codes are a system of postal codes used by the United States Postal Service (USPS) since 1963. The term ZIP is an acronym for Zone Improvement Plan. All U.S. addresses have a standard five-digit ZIP code that informs the postal service of the area of the country and the post office where mail is received. In 1983, the USPS added four digits to ZIP codes to help further pinpoint a recipient's location.