Task: Explanation
Input (English): Benjamin Pulleyn ( ; died 1690) was the Cambridge tutor of Isaac Newton. Pulleyn served as Regius Professor of Greek from 1674 to 1686. He was known as a "pupil monger", meaning one who increased his income by accepting additional students. Question: Benjamin Pulleyn was the Cambridge tutor of an English mathematician, astronomer, and physicist, whose book,Mathematical Principles of Natural Philosophy, was first published in what year?  Answer: 1687
Output (English): Benjamin Pulleyn  ; died 1690 was the Cambridge tutor of Isaac Newton.