Ever since records began, in every known society, a substantial proportion of the population has reported unusual experiences many of which we would today label as "paranormal". Opinion polls show that the majority of the general public accepts that paranormal phenomena do occur. Such widespread experience of and belief in the paranormal can only mean one of two things. Either the paranormal is real, in which case this should be accepted by the wider scientific community which currently rejects such claims. Or else belief in and experience of ostensibly paranormal phenomena can be fully explained in terms of psychological factors.