I was bored one day and decided to pick this one up since I heard it was a classic sci fi. I usually read fantasy but I like Neal Stephenson and Robert Heinlein so I figured I would buy this one. OMG so amazing. I read this book in one day and literally didn't stop once I started. I see why it is a classic. It is written with wit, humor, and has a lot of philosophical wisdom snuck in there as well. If you like sci fi or fantasy you have to read this book immediately if you haven't, and if you have, read it again. Fantastic!