"I wrote this book with Jorge Cham because we were really excited to share our enthusiasm for exploring the unknown, or looking out into the universe and thinking about the possible crazy things that could be revealed to us. There are lots of books out there about science and explaining what science does know and all the amazing things science has learned, but we really felt like nobody was talking about what we don’t know, what’s out there left for young people who are going into science to discover and people who are interested in science, what they might learn. "