Krauss is clearly brilliant. The book is ambitious (massive understatement), and well done. It's deliciously, intentionally hostile to religion. Not sure why I didn't give it a 5 other than I reserve 5's for books that either (a) drive me to tears, or (b) make me dizzy with enthusiasm for living and learning, or (c) both. This book got close but not quite (CBNQ). Take home message "nothing is unstable". Read it if you want to find out what that means.