This issue represents a partial summing up of my thinking over the past 50 years on ESP as it relates to Paranthropology and the anthropology of consciousness that led me to the work of Krippner. From my perspective the papers in this issue represent a cautious as possible attempt to assess experiences and events that Euro-American science has ignored because they are beyond the limits of its paradigm. Still many readers of this issue (especially those outside of Paranthropology) will view its papers as a form of science fiction. And yet none of us knows for sure if there are mysteries to be solved that a new paradigm could help us understand. To those of us who may say I have gone too far with my theoretical speculations in this issue, my reply is that I have not gone far enough. If humankind's collective wisdom has taught us anything, it is the fact there is always more to know, and that the most powerful tool we have in science is doubt.

- Mark A. Schroll (Guest Editor)