If in the wrong hands they control our minds. MK Ultra, TV, radio, remote viewing, telepathy! Its an evil process when in the wrong hands. I had a retired NASA employee who used to do this tell me when I asked him why he stopped and finally retired, he stated “ I was tired of doing evil and hurting people” He even tried using it on me without my knowledge and as I was talking he interrupted me and asked me if I had heard what he had said and I said yes and repeated his words back to him and puzzled, he looked at me and said you are an interesting case. https://files.eric.ed.gov/fulltext/EJ1207818.pdf