The Royal We: “Toward the end of our conversation Humphrys pointed out something I hadn’t considered. The same process works going forward in time; in essence every one of us who has children and whose line does not go extinct is suspended at the center of an immense genetic hourglass. Just as we are descended from most of the people alive on the planet a few thousand years ago, several thousand years hence each of us will be an ancestor of the entire human race - or of no one at all.”