If your friend gets a new email address, it doesn't go into your brain and find your friend's email address cells and replace his email address in that part and you know those neurons in your brain. Memory is essentially an Open System and it's an associative system, not an address-based system.
YOUTUBE -6BsiVyC1kM The Value of Values with Rich Hickey
We used to keep records before we had computers, what did we do? We took out the stone tablets and chiseled a thing or we took out the papyrus and wrote stuff down. When we had new information, what did we do? We didn't go and like smooth over the marble and chisel new stuff in, we didn't go to the papyrus and take out erasers and things like that. And if people built accounting systems before there were computers, they didn't use erasers either. What did they use? Double-entry bookkeeping, ledger-based bookkeeping, they only made corrective entries, they didn't go back with erasers, that's not the way things worked before we had computers.
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The value of values. page 