This book is not in the least factual and me being a roller coaster enthusiast can prove that. It doesn't explain about the forces that you experience while on a coaster and why there is so much math involved when designing one. It is disappointing how a book can be so wrong. Do not buy this book as there is way more factual information online. I recommend a YouTube channel called coaster bot. He explains rides and parks in great details that anybody can understand.