A truly wonderful book from the celebrated scientist, which discusses Einstein’s general and special theories of relativity - having to do with gravity at a macro level - and the uncertainty limits imposed by quantum theory, which examines reality at the most micro levels. Hawking’s great search was for a Grand Unified Theory that brought gravity and quantum physics together, and he believed it was coming. It has yet to come. I cannot confess to having understood all of the concepts in this book, yet I understand enough, I think, to appreciate his conclusion. Hawking asks lots of questions about God - is there a place for a creator in a potentially boundary-free universe without singularities past or future? Hawking acknowledges that our best theories are still only models which can potentially explain the how of the universe, but never the why. Why does life, reality, creation insist? He says to understand that would be to understand the mind of God.