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.
US ZIP code. The postal code system used in the United States of America is called ZIP Code. ZIP is abbreviation from Zone Improvement Program. US ZIP codes were introduced in 1963 to improve mail delivery, make it more efficiently, quickly and simplify it. In 1943 postal zones were implemented by the postal service for large cities.