We have selected a wide range of topics from the field of computer science, and packaged them so that they can be learned without using a computer. They will give you a good idea of what computers can and can’t do, what they might be able to do in the future, and some of the problems and opportunities that computer scientists face now. But the main reason that we wrote this book is because computer science is fun. You don’t believe us?---read on! The subject is bursting with fascinating ideas just waiting to be explored, and we want to share them with people who might not be tuned in to computers, but would be interested in the ideas in computer science. These activities will certainly give you something to think about.