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Definitely thought provoking. The data and research provided in the book is extensive; not a book that just wants to push an idea,rather, the authors approach their hypothesis scientifically, trying to disprove themselves along the way ,in order to maintain a valid study. You may know that Nasa deliberately 'rang' the moon twice, the first time was by accident, or incidental.The second time, they did it with a close ear to listen. The book is astounding and fun to read.