I was on a trip with my 18 year old daughter recently. While waiting for food at a fast food restaurant for a couple of minutes, I was standing at a window just looking out and kind of planning out in my head a bit of the next couple of days. When my daughter came out of the restroom, she wanted to know what I was thinking about. She could not imagine that I would just think to myself for a couple of minutes when there was so much entertainment to be had on my phone. She would probably use a Heads Up Display for running if it existed.