During the blizzard in Oxford, I went down the High Street to find the memorial on the wall of University College. Boyle's Law for gases now comes towards the end of the Upper Sixth. I didn't know that Robert Hooke was his assistant. Hooke was Newton's bitter rival, best known in physics and engineering for Hooke's Law: the extension of a spring is directly proportional to the applied force as far as the limit of proportionality.