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Life outside of earth has never been unambiguously observed and verified. Consequently, discussions about the possibility of life beyond earth inevitably begin with thoughts about how life originated here. There seems to be an emerging sense that life is the result of a universe that is naturally self-organizing (Stuart Kauffman is in this camp. See his book "At Home in the Universe, Oxford University Press, 1995). According to this point of view, life is all but certain to arise on any planet having the basic chemicals and physical conditions found on earth 4 billion years ago. Given this hypothesis - that life arises quickly and naturally in the proper environment - it's natural to ask if any other planets in the solar system have (or had) the necessary ingredients. If they did, we should look to see if life evolved there. Since there is growing evidence that Mars had a distant past with some of these conditions, it seems more and more important that we look for life on Mars. Finding evidence of life there would buttress the concept that life readily evolves given the proper environment. Obviously, if that's the case, it holds enormous consequences for modern science.
Walter has a nice chapter on the tree of life, and describes recent information showing that "all the lowest branches of the tree are occupied by hyperthermophiles." The discovery that life exists on earth under extreme conditions (like those of deep-sea thermal vents) has increased the hope among scientists that it might also have evolved and flourished on Mars many thousands of millions of years ago. He also shows how genetic transfer between species happens today, and was probably common among our earliest ancestors, so that the whole concept of a "tree of life" becomes somewhat tangled during the earliest stages of the evolution of life. Instead of a tree, the topology looks more like a web, with the roots of the tree (consisting of Bacteria, Eucarya, and Archaea) rising out of this web.
The expectation of finding evidence of life on Mars depends on the type of environment that Mars supported in the distant past, and the circumstances under which life arose on earth. It also depends on how easy it is to ascertain the evidence of fossilized ancient microbial life. It turns out that identifying evidence of microbes in very old rocks is a pretty hard thing to do. To illustrate this, Walter describes the difficulty of identifying stromatolites in ancient rocks. This was new information for me, and a real insight into the nuts and bolts of making these sorts of identifications. I'd thought that stromatolites were easy to identify, but in the very oldest rocks, they're not. When identifying stromatolites in rocks 3000 million years old, there can be (and often is) a great deal of controversy regarding the conclusion. Walter's point in making this so clear is that stromatolites are large colonies of microbes, yet even they are not unambiguously identified in the oldest rocks. The problem of identifying evidence for individual microbes in rocks 3000 to 3500 million years old is even tougher. The point being that even with Martian rocks in our hands, it's not going to be easy to affirmatively state whether there is evidence of ancient life on Mars.
To drill the point home, Walter points to the fact that we do have chunks of Martian rocks on hand, in the form of bits and pieces that have been blasted off the Martian surface by meteorite impacts. Walter describes in detail the scientific examination of some of these rocks, and one, in particular, identified as ALH84001. This meteorite made world news when a team of scientists reported finding evidence of ancient microbes buried inside it. Walter describes the initial reports, the objections, and the eventual state of limbo in which these conclusions came to rest. This helps set the tone for expectations regarding the difficulty against which such analysis will proceed even when we manage to return samples from the Martian surface using spacecraft.
In describing how scientists make conclusion about the presence of microbes in ancient rocks, Walter does a real service by illustrating the importance of convergent evidence. Identifying ancient microbes involves more than one type of observation. It involves many types of converging data, including visible observations of deposits in rocks, the types of rocks involved, and things like carbon isotope ratios (not to be confused with carbon 14, which decays far to quickly for analysis in 3000-million-year-old rocks). Along these lines, I noticed a recent article in Photonics Spectra (May 2001) describing the use of Raman imaging to identify microfossils - another tool, in the search for the ancient life on earth, and possibly on Mars.
The book ends with some very informative discussions about proposals for future landing sites on Mars, for sample analysis and/or return.
This is a very informative book, with useful insights into the way science works, complete with several pages of color plates, a useable index, and short list of further reading material. If you are interested in what NASA does, and how the scientific search for life on Mars is (and will be) carried out, I think you will like it. I certainly did.
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The authors do seem to be supporters of the pseudoscience astrology, although they never make a case for it in this book.
Astrology is supposedly based on the movements of the heavens, but I have never met an astrologer who even begun to understand Kepler's laws or Einstien's relativity equations, all which describe the movements of the heavens.
Two technical errors in the book: They say (p72) that Pluto is bigger than Mercury. No, Mercury is over twice the size of Pluto.
P. 43 says there were 3 kings in the Christmas story - a common misconception. Technically, it doesn't say how many, which is why some traditions hold many more.
A note on p 105: They mention the "unknown God" that Paul refers to in Acts. They are apparently unware of the historical records which suggest this monument to the unknown god was dedicated to the God of Christianity years before Paul arrived after this God performed miracles for people in the area. An interesting look into biblical authencity that the author's overlooked.
The really outstanding part of this book is the section on Sacred Alignments. The astronomical designs and spiritual purposes of twenty seven ancient sites are explored. In addition to the obvious ones like The Great Pyramid, Stonehenge & Avebury, the book explains the layouts of such far flung power centers as Hashihaka in Japan, Vijayanagara in India, the Cahokia mound complex in Illinois, the Chaco Canyon "Ancient Ones" area in the Four Corners region, and several South American sites including Machu Picchu. Just enough to stimulate one's curiousity for more learning.
These wise, ancient peoples experienced the world in ways that are difficult for us to know. But we must try. To do so, we have to get past our limited geo-political views. Gaia deserves no less. The sky belongs to no one. The sky belongs to everyone.
Bob Rixon
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This is the story of Paul Taylor the Washington Post reporter that broke the story of Gary Hart and Donna Rice and ended Hart's chances at being President in 1988. More importantly, Taylor asked "the question" that changed the way media cover politicians.
"Did you commit adultery?" There it is. Simple by today's standards of DNA dresses and DWI Presidents.
By understand what happened to Hart, you can see the Clinton circus coming a mile away. Taylor gives honest account of one of the first political/media "feeding frenzies."
If you believe that Taylor didn't understand the watershed moment in politics he was creating when he asked Hart "the question" (and I'm not sure I buy it) than you can really get into Taylor's first hand account of the campaign, the challenge, the chase and the media explosion that followed.
The reason I gave it four stars and not five, is that Taylor gets too preachy in the end by using his experience with the demise of Hart to tell us what is wrong with Presidential politics and how we need to fix it.
The fact that he is right has nothing to do with it. He is right, but that's not why I bought the book.
In short: good writing, good story, good reference point to understand the media/presidential politics relationship. Worth the time to read but not going to change history as Taylor clearly hoped it would.
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I find Krassner's reportorial meddling in proportion to the sanity of the story's surroundings. When he's forced to perch (the Patty Hearst trial, the Moscone-Milk murders or Jonestown), he's still meddling with the players, but the events themselves are so mired in political agenda, shoddy lawyering, power freaks gone mad, and (of course) Krassner's own paranoia, that making sense of the facts becomes a struggle against sheer exhaustion.
His style in his California social landscape pieces keep good company with Joan Didion's work in Slouching towards Bethlehem. Unlike Didion, who is practically pH-neutral in her reporting, Krassner is hip to his scenes. In this collection he covers New Age guru Terence McKenna and a Swinger's Convention. Like Didion, though, he can participate without losing his role as a reporter to us. He reserves comment in places where I suspected he might well have interjected an insight, but you might also say he just lets his subjects speak for themselves.
Of particular note: Krassner's collation of facts around Patty Hearst's kidnapping and trial for bank robbery show how exhaustion can beat the reporter down. The center cannot hold in those stories, and Krassner doesn't try to manufacture a stable one. The Hearst pieces best reflect Krassner's conviction that people with power have no use for reason unless it suits their purpose. That's a harsh world, one that's as difficult to deny as it is to accept.
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I LOVE this book and the rest of the series. The artwork and the writing work perfectly together - telling a complex and intelligent story without losing the sense of innocence and fun that is at its heart.
I've given copies of the book to adult friends of mine, children, and early teens and all of them have enjoyed it.
I won't buy a book for a kid or teen unless I've read it and liked it. I've had a hard time finding adventure books about girls (there are so few) that fit this bill. But "Leave it to Chance" is a winner.
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Having lived in the Colorado Front Range for 16 years, I can say with certainty that Lewis' Chapters 4 and 5 remain the ONLY comprehensive treatment of the growth patterns and policies in the Denver metro area. It should be required reading for legislators and civic leaders who grapple with growth and planning issues in Colorado. What's more, the solutions to the problems Denver has endured are apparent to the attentive reader, although their is no 'cookbook' recipe for change.
A timely and impressive piece of scholarship.
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It begins with a cursory introduction to SAS, emphasizing the need to properly plan your data processing and analysis, the logic of debugging, etc. From there the following chapters cover data step data manipulation and processing, functions and the addition of new variables to a dataset using functions, and a good treatment of the IF-THEN-ELSE statements including loop counters. The following chapters cover branching, DO loops, and data manipulation with arrays. The treatment of DO loops and arrays in particular is especially good; very helpful in teaching one the logic of how they work.
This book, however, is NOT one to get if you are looking for examples of SAS programs. Each chapter makes use of only one or two programs, each written with the sole purpose of illustrating how particular commands work and what they produce. You won't find any examples of how to program an ANOVA or a T-test here, or other examples of SAS/STAT programs.
Also, you should have some background in SAS already, namely you should know how to write a basic data step, how to write a basic PROC step, and the order hierarchy of commands in the steps. This book is NOT a basic introduction to SAS.
For an exceptional introduction to SAS for green newbies, get Hatcher and Stepanski's book (ISBN 1-55544-634-5) and for examples, you should look to Cody and Smith (ISBN 0-13-743642-4).