The world is full of sensible advice that’s hard to put into practice. Do more exercise. Reduce your stress levels. Accept that salt and vinegar flavor chips are not, in fact, a mainstay of a well-balanced diet. (Damn). Oh, and keep your tweets and subject lines short. Actually, you can argue about that last bit of advice. But if you have something to say and have two equally impactful ways of saying it, then pick the shorter one. Often it’s just a question of practicality.