I was going to give the book only four stars because I did not like the organization of the chapters. I decided, however, that the content was so good that nothing should detract from it. I learned more than I could have possibly anticipated and my thinking has been deeply influenced by Friend's reporting.
This is a book about archaea, probably the most numerous of the three domains of life on earth (eukaria, bacteria, and arachea) but unknown by most persons. Archaea have come in the news recently because some, known as extremeophiles,live in seemingly hostile conditions -- very high or low temperatures, high in the atmosphere, and in toxic chemicals or radioactive conditions. The most important part of the book is the hope the knowledge of these microbes may provide for a better future with possible solutions for global warming plus numerous manufacturing uses, energy production, and numerous other problems.