Which is an alleged ability to influence a physical system without physical interaction?

Psychokinesis (from Greek ψυχή "mind" and κίνησις "movement"), or telekinesis (from τηλε- "far off" and κίνηση "movement"), is an alleged psychic ability allowing a person to influence a physical system without physical interaction.

Psychokinesis experiments have historically been criticized for lack of proper controls and repeatability. There is no convincing evidence that psychokinesis is a real phenomenon, and the topic is generally regarded as pseudoscience.

There is a broad scientific consensus that PK research, and parapsychology more generally, have not produced a reliable, repeatable demonstration.

The ideas of psychokinesis and telekinesis violate several well-established laws of physics, including the inverse square law, the second law of thermodynamics, and the conservation of momentum. Because of this, scientists have demanded a high standard of evidence for PK, in line with Marcello Truzzi's dictum "Extraordinary claims require extraordinary proof". The Occam's razor law of parsimony in scientific explanations of phenomena suggests that the explanation of PK in terms of ordinary ways — by trickery, special effects or by poor experimental design — is preferable to accepting that the laws of physics should be rewritten.