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.
Using area codes to help efficiently sort post was introduced in 1943. However, by the. 1950's a more specific and detailed guide was needed. This is when the United States Postal Service began using the ZIP code (ZIP meaning Zone Improvement Plan). It was first thought of by postal inspector Robert Moon - he submitted the proposal for a ZIP code in 1944.