Perhaps the most important discoveries are those which relate to the appropriate distribution of the periods of study...Acts of revision should be spaced in gradually increasing intervals, roughly intervals of one day, two days, four days, eight days, and so on.
Our brain forgets quickly newly learned information. Spaced repetitions are the most effective approach to internalize.
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The speed of forgetting depends on a number of factors such as the difficulty of the learned material (e.g. how meaningful it is), its representation and physiological factors such as stress and sleep. Furthermore higher original learning also reduces forgetting. The rate differs little between individuals.
I made an awful mess of my first marriage. It was hard to live with me being me. I was so abnormal. I mean, most writers struggle. I hadn't struggled. I couldn't suddenly go down to the PEN Club and behave like a normal human being, because most of those guys were struggling to make a couple of thousand pounds a year.