The human brain’s ability to recall things from memory (without you even knowing) is remarkable.
I just walked out to my car to get something I left there earlier, and on my way back into the office I typed in the code to the cipher lock on the door and went on my way. I didn’t think about or try to remember a combination; I just typed it in and opened the door.
As I walked back down the hall, I started to think about all the numbers I have memorized: phones, ATMs, lock combinations, online passwords, smart card pins, security codes at work/home, etc. I attempted to make a mental list and put all the codes/passwords to the right application, but it just started to get confusing.
It’s really a miracle that I can walk up to an ATM or go to a web site and enter the proper credentials without conscience effort. I can dial my wife’s phone number without a second thought, but if you asked me to tell you her number I’m probably stumble through it.
We are amazing machines.