Dear Raghav,
Let me express myself further to what all the learned members have beautifully said. Michael Moroney's article suggested by Mr.Simhan makes a wonderful reading on the topic and the examples cited by Mr.Dinesh makes it highly illustrative.To me, (of course not in an offending sense) your attempt without a research to post the query in the midst of availability of a sea of articles on the topic is an act of smartness! Pl leave it.Coming to the second part of your query about the relevance of the concepts of " working smart" and " hard working" in the modern era, the answer is in the article of Moroney itself.Hope you remember the mythological anacdote of Lords Ganesh and Muruga over the divine mango fruit.Muruga had a vehicle with a super-sonic speed which Ganesh did not.So he used his lateral thinking and asked the referee himself whether the parents would be the universe to their children, got the affirmative answer and finished the cicumambulation of his parents well before Muruga finished his cicumnavigation of the universe.So, every thing, transcendent of the barriers of time and other difficulties, depends upon one's perseverance, rapidity and accuracy. Here, perseverance refers to hard work and rapidity and accuracy to smartness.