Synaptic pruning is the medical term. We remember what is fun, important, or impactful to us...and overwrite the memories that are of little importance.
I remember a ton of life stuff, but I won't remember what the wife just sent me to the store to get. I make her text me so I have it. I am also crazy good at remembering numbers for some weird reason. Phones...bank accounts...dates...whatever it is, as long as it is a number, I will remember it.
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