In his classic A Mathematicians Apology, published 65 years ago, the great mathematician G. H. Hardy wrote that "A man who sets out to justify his existence and his activities" has only one real defense, namely that "I do what I do because it is the one and only thing that I can do at all well." "I am not suggesting," he added, "that this is a defence which can be made by most people, since most people can do nothing at all well. But it is impregnable when it can be made without absurdity ... If a man has any genuine talent he should be ready to make almost any sacrifice in order to cultivate it to the full."G. H. Hardy, as quoted by Aaron Swartz.