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Harrison is both an expert in, and an aficionado of, the grand ideas about creation, so the hard science here is interspersed with relevant pieces of history, philosophy, and literature (i.e., the humanities) -- but not too much, rather just enough to give an appreciation for how great minds of all sorts have wrestled with these problems in one form or another for as long as we know. And Harrison has a way of boiling down the difficult concepts to their essentials, making an opaque subject transparent.
Even though the scientific level is moderately high for a book aimed ostensibly at novices, there are no lengthy mathematical derivations or formulas of the sort that one might think would be necessary to convey, say, Einstein's general relativity or the intricacies of sub-atomic physics. Often taking an order-of-magnitude and geometrical approach, the book avoids long confusing digressions into trivialities and summarizes many of its important points in excellent diagrams. Harrison is great at bringing in just enough from some other branch of physics to help you grasp the topic at hand, so the development as you progress through the book is nearly perfect. He's also excellent at conveying the important conundrums, uncertainties, and many pitfalls in the field. The coverage is very balanced and complete, yet anything but shallow.
Even though I was a grad student in astrophysics at Berkeley, I didn't learn cosmology from Joseph Silk there. Instead, I learned it after I left -- from this book (the 1st edition). Harrison is that good at making what can be a perplexing subject both interesting and understandable. I came away from it feeling I finally "got" cosmology, the grandest of all subjects.
The only better book for the less serious lay person or someone who finds scientific material difficult would be his "Masks of the Universe" -- unfortunately now out-of-print, but well worth tracking down.
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