Multi-tasking

As a senior citizen (almost 73) I am trying to catch up with the information revolution. It's not easy; cell-phones, E-Mails, movies-on demand. I'm learning but slowly. What is astonishing is how many things we can do it at the same time: hum a tune, think of old memories, think happy thoughts, ( or sad ones) watch television all at the same time. How remarkable!