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.
The definition of source is where someone or something came from. An example of a source is solar energy coming from the sun. An example of a source is the person who inspires you. An example of a source is the person who gives a juicy story to a magazine reporter.