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‘My other piece of advice, Copperfield,’ said Mr Micawber, ‘you know “Annual income twenty pounds, annual expenditure nineteen nineteen six, result happiness. Annual income twenty pounds, annual expenditure twenty pounds nought and six, result misery.”’

Charles Dickens, David Copperfield

I recall a story (that I hope is true) about Prof. Stephen Hawking and his exceptionally successful book A Brief History of Time. In dealing with the big things of the universe it was inevitable there would be many scientific concepts and equations necessary to explain it all. But the publisher told Prof. Hawking that for every equation he put into the book, ...

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