Memory formation becomes more effective with longer inter-stimulus intervals between training sessions because of decreasing temporal overlap between successive, short-lived learning traces.
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 hardly look at myself in the mirror... I'll only wear makeup if I need to cover something up. But I've recently started caring about my skin. I just turned 60 and was like, 'OK, maybe it's time to start thinking about it.' Before that, I would just splash water on my face, put cream on, and then leave.