Think a newly laid out grass between several buildings. It’s green and solid. Now people are taking short cuts across the grass when moving from building to another. As they walk the they create paths (called in landscaping as desire paths). Grass gets stomped and turns to muddy path.
Now if some path is not used in long time, grass will regrow there. First slowly and at some point you can’t longer tell if there ever was a path there at all.
This is how memory works (in ELI5 terms) and how you forget stuff. Now paths are neuron connections on your hippocampus (grass) and buildings are different parts of brains (including sensory parts).
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