The answer is surprising to so many people. Now people think that technology rules the day and we know everything regarding whatever subject is brought up. The simple truth is we have yet to determine that. There are many theories as to the memory system or processes of the human brain. Scientists and neurological specialists are digging into it. The human brain is one of the most spectacular things we have ever encountered. Yet, it is not a Newman-based computer sitting on top of the desk that often will give error codes when malfunctioning. I get amused as I take a medication called Xanax, which was discovered back in 1970. If you read the patient leaflet, the last line is always, "The mechanism of action of this medication is poorly understood." It is the most prescribed psychiatric drug in the world, and we know it elevates a neurotransmitter in the brain called GABA. Other than that, who knows? It is just effective; yes, we cannot fully explain why.