This is one of the best books I have ever read. It Explains the world we are living in, but it is not just a scientific book. It unites so many fields of knowledge did I assume, Sagan must be a genius. Philosophy, Physics, Maths, Relegion, all that is coming together in a Masterpiece That You Will Be unable to put down, eager to know what is happening on the next page, what the author wants miacles reveal to you ... It is just so beautyful ... If You Want to have Cosmos in a story by the way, read Contact. Sagan's works will stay with us alongwith Those of Hawking ... Buy this and change the way you live and look at the world you're living in.