Addiction: Central nervous system (CNS) stimulants are addictive, even if they are not abused. Many factors, including the patient's personal history, the type of stimulant that is being taken, the dose of the drug, and duration of use, influence how likely an individual is to become addicted.
The source of all waves - mechanical or electromagnetic - is something that is vibrating. Matthew Donovan.
An energy source is usually in the form of a closed system, the element that provides the energy by conversion from another energy form; However, the energy can be quantitative, the balance sheet is capable of containing open system energy transfers.