Imagine a light snowfall. As time goes by, the snow covers everything so you don’t know what is under it. That is memory loss.
Now imagine learning something new as making a path in the snow. Some less significant things (e.g. phone numbers) leave small paths, like rabbit tracks, more significant events (e.g. an embarrassing moment) leave big deep paths. Small paths will be buried and forgotten soon, big paths will take a long time, and might still be recognizable later for the “canyon” they make in the snow.
Repetition is going over the path again and again. It makes a deep path even if it is a less significant memory.
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