The term psychokinesis (from the Greek ψυχή, "psyche", meaning min, soul, heart, or breath; and κίνησις, "kinesis", meaning motion; literally "movement from the mind"), also known as telekinesis (Greek τῆλε + κίνησις, literally "distant-movement"), sometimes abbreviated PK and TK respectively, denotes the purported ability of the mind to influence matter, time, space, or energy by means outside the currently known laws of physics. It has been called the most powerful of psychic powers, essentially the power of a god. Examples of psychokinesis could include distorting or moving an object, or influencing the output of a random number generator. The study of phenomena said to be psychokinetic is an aspect of parapsychology. Some paranormal researchers believe that psychokinesis exists and deserves further study, pointing to experimental results such as those done using random number generators. Skeptics contend that psychokinesis does not really exist, and that claims that it does are based on publication bias, fraud, delusion, statistical manipulation of scientific data, or other naturally explainable phenomena. Psychokinesis is popular in some entertainment movies and television programs featuring paranormal, fantasy, religious, and horror themes; written fiction; and computer games.