books.google.fr - At the heart of the parapsychology (psi) battle are two types of phenomena: extra-sensory perception (ESP) and psycho-kinesis (PK). ESP is reception of information without any normal sensory means; PK is the use of the mind to influence physical states without any direct physical contact. Neither effect...https://books.google.fr/books/about/Psi_Wars.html?hl=fr&id=JyfbUvuJbbYC&utm_source=gb-gplus-sharePsi Wars
