These are things I've been thinking about a lot lately, so good to have it all clearly explained. Those of us who were alive in the early part of the 20th century have already lived through amazing changes and advances. Some of us have embraced them, others are stuck in the Victorian era - no computer, no mobile, etc. There are still cultures on earth who are living practically in the Stone Age while others are reaching out to Space. We surely are living in 'interesting times.' Looking forward to your next post.