In the academic year 1994-95 I was a member of the School of Mathematics of the Institute for Advanced Studies in Princeton, and I regularly went to the Math library of Princeton University, in Fine Hall, to read journals that were not available in the Institute's library. Once, sitting almost across from me at the same table, was Andrew Wiles (Wiles' proof of Fermat's Last Theorem had just been accepted as correct by the mathematical community in August of 1994). At some point Wiles left and left the book that he was reading, as you're supposed to do, on the table. After a while, seeing that he was not coming back, I got up and looked at the book that he was reading. It was a famous book by Titchmarsh entitled: "The theory of the Riemann Zeta Function".