This book is a great dive into the world of early software development by the man who wrote a lot of the code for guidance during the landing phase of the Apollo lunar landings. Details of the culture at M.I.T., dealing with management at NASA, Grumman, and astronauts. Details about the logic behind the code and working with a team of people to write code. Nice details about the man behind the Apollo 14 hack and what really happened with that. If you are a Apollo fan this is great read.