What Makes a Memory?

What makes a memory? How do some things stay in your mind while others just slip away? An uncountable number of events happen in our lives, but only some of them stay with us.

I often wonder why certain memories stick, especially those that don’t really seem that memorable. I wonder what it was about that event or feeling or physicality of the moment that keeps it in my mind as a memory. How does my brain decide to hold on to it?

There are more memories I wish I could retrieve but I cannot. Why didn’t my brain keep those?

I’m sure I will never know the answer to my questions. But I wonder if you wonder about this too.