How can experience be so valuable in some professions, but almost worthless in others? To see why, suppose that you are playing golf. You are out on the driving range, hitting balls towards a target. You are concentrating and every time you fire the ball wide, you adjust your technique in order to get it closer to where you want it to go. This is how practice happens in sport. It is a process of trial and error. But now suppose that instead of practising in daylight, you practise at night – in the pitch-black. In these circumstances, you could practise for ten years or ten thousand years
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