Fun story. Back when I was a bit younger, I once forgot the 4-digit PIN of a cash card after a heavy night of drinking, even though I had used the card for many

Fun story. Back when I was a bit younger, I once forgot the 4-digit PIN of a cash card after a heavy night of drinking, even though I had used the card for many, many years almost daily. It was just gone, no matter how much I tried to remember it. (Then, getting a new card took 3 weeks or more, so I tried a lot.) My guess is that some information is stored in the brain chemically in few brain cells, and when they're gong, it's gone.