@farmerman,
farmerman wrote:
......When Knoll wraps ir up, he uses the field evidence here on earth to reccomend a discipline in which to analyze the possibilities of life on other planets. (That section is kinda wifty but I think he had a page count contract)
The word "wifty" - probably a typo - somehow describes the status of probabilistic calculations for the emergence of consciousness.
Nobody understands consciousness, let alone how to calculate probability of its appearance. Very roughly, for a unique universe, the one we see, the numbers are: about a quintillion planets; by heroically throwing zeroes by the wayside we come up with about a million planets meeting the specs (such as liquid water) for life to appear; of these, some may see simple (non-eukaryotic) life forms; some of those may cross into more advanced entities. But we may be alone in having consciousness - really, really, low probability event.
Btw, I owe an explanation to Ionus, to whom I said that once something has happened its probability gets to 100% and stays there forever: that's only true where there's decoherence of the wave-function - i.e. we opened the box and found if that cat is definitely dead or definitely alive. If the wave-function never decoheres - which is theoretically possible if there are infinitely many parallel universes - the cat is alive in some, dead in others, and suspended in some quantum uncertainty in all the rest of them.
The mathematics in the non-decoherence case are beyond me, but here's an article, with chart:
http://space.mit.edu/home/tegmark/crazy.html
Evolution, on the other hand, is an extremely high probability process in all cases where life has started; a certainty on our own planet - it has happened and will continue happening as long as there's life forms of any kind. But the idea of all those infinite, eternal, parallel universes is so much beyond most peoples' conceptual abilities (mine included) that it really seems simpler to believe in a god of some sort.
Back to your book review - is this, roughly, the author's probability calculation for life on other planets?