I am responding to the person who wrote the second review, the student who decided to use this book to study for an exam in basic calculus. What are you, crazy? Why would ANYONE think they could learn "baby calc" from the great book in which Newton elucidated his theory of the universe!? Did you think about asking anyone, first? I'm a college math prof and my guess is that ANY math teacher would have suggested you study from a modern, elementary calc book, instead. (Then you make matters worse by giving the book a bad review!) At any rate, if you would like a good, modern translation of Newton's Principia, this is the place to go. You really should know some calc and basic mechanics, however - remember, this book, was written by one of the greatest minds in the human history, and it was NOT meant to be a textbook for the novice. Please do not let review # 2 steer you away..........