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Universe or Multiverse
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This is a book of essays by very prominent and knowledgeable scientists and philosophers who discuss the reason that our universe has the very special characteristics that allow life and conscious observers to exist. Primarily they discuss this in terms of the anthropic principle. Most of the authors assume an infinite variety of universes, mostly without life. Only a tiny fraction of these universes have the characteristics that enable life and observers to exist and of course we can only exist and observe a universe with the very special characteristics that enable us to exist. The book omits another argument to "explain" those special characteristics. According to quantum physics, a system may not have real, definite characteristics, having only a superposition of possibilities, until those characteristics are observed. Extending this to the whole universe, the universe cannot become real unless it is observed. Thus, for self-consistency, it must have the characteristics which enable observers to evolve, thus eliminating the need for an infinity of universes without observers.
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