See, this is where it all gets confusing. What's natural for a fact? Would astral projection go under natural? Perhapes astral projection is natural, but it's impossible to see and study about it. Psychics, mediums, etc, could very well be natural but we don't understand it. Science, afterall, knows that energy cannot be destroyed, only changed in form.
Well Kim, the issue is, there is no actual, measurable form of "energy" that a person inherently posesses, that has been observed to leave the body on death, or during these states (and I'm saying this as a philosophical Daoist). Astral projection is also identical to lucid dreaming, which can be induced by certain chemicals. If these lucid states, where the mind projects semi-abstract representations of the local enviornment, can be caused by ingestion of chemicals, this raises strong doubt the phenomena is dependent on a "bioenergy field".
The website research conclusions at the top of the page talks about everything from near-death-experiences, psychics, afterlife, spirit world realms, time, astrology, psychic Edgar Cayce, etc, in an unbiased format.
Astrology, at least in the common way it is practiced, is proven to be complete nonsense. Please also see Wikipedia's articles on these subjects:
Edgar Cayce
Astrology
Afterlife
Psychic
Most people on this James Randi website, and James Randi himself, believe in the Nature/physical plane and only the Nature/physical plane. The latter is where everything starts going downhill into an argument.
Randi is pro-actively trying to get to the bottom of it all by putting a million dollars in cash on the table. This is a glaring challange, as it plays on the two primary motivations of charlatans:
1) They take money from others.
2) They attempt to convince others something mysterious is true.
So far, nobody has stepped up to the plate in any reasonable way. Randi represents someone with the alarming realization that a lot of people are being taken advantage of. When you consider what pedators like John Edwards and Sylvia Browne pull to garner wealth and fame on the backs of grieving people, an air of impatience is quite restrained and tactful.
I'm skeptical of anything until I've experienced it/done it. I appreciate everyone here saying what they like, even if it sounds cold. I'm just saying what I believe in, too. Maybe we can all learn a lot from each other.

Thanks.
I'm not; most conclusions I make are by implication. A small part of me believes in blue hued spirits - because I saw one vividly one time for half a minute - and few common explanations satisfy me. However, the
logical inconsistencies in such a thing happening make it highly improbable that it wasn't some type of hallucination. Everything from a bad hair day to a computer crash has a series of tangible links that proceed it. In the latter case, those links are complex, while the former are not. If something doesn't have these, it is not an actual, objective event.