Once, I was on a long hike far away from the trailhead. My phone battery died, and there was no one around, so I needed something to occupy my mind for several

Once, I was on a long hike far away from the trailhead. My phone battery died, and there was no one around, so I needed something to occupy my mind for several hours. One thing I came up with was trying to remember as much as I could about the previous years of my life. It's really a great way to entertain oneself with no external input.