Trailers for the new Hollywood film White Noise purport to contain genuine, unedited voices from beyond the grave. These so-called EVP do exist, writes Robert Matthews, Science Correspondent. At one point in the new Hollywood chiller White Noise, Jonathan Rivers, a bereaved husband is told that he is not going about communing with the dead in the right way. "You shouldn't be trying to do this by yourself," the nervous psychic tells him. "EVP is not good." The film's makers are certainly hoping that Electronic Voice Phenomena are very good – at least for business. They are doing everything they...