It scared the life out of me when I saw the size of this book but like paulsaunders18 said, don't be put off by the size of the book. I've read bits here and there and it does amaze me how Newton wrote this book, it's no surprise nobody could write anything to confront him. I really recommend this book to anybody that knows of Newton's works like F=ma, but that is all high school stuff. Newton really really makes you think hard in following his work which is an honour to read. No wonder he went mad. Buy it..quick..in the mean time do some weights.