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.
In fact, they're only 52 years oldâa concept that was introduced during World War II, and officially implemented in 1963. The zip (Zoning Improvement Plan) code was created when the postal service lost a huge portion of their staff who went to fight in the war. Because of this, they needed a simple way to help the understaffed postal service deliver mail effectively.