The best illustration of this is when we ran a story of Neil Armstrong landing on the moon. We updated that story for our readers as the lunar module was making its way from earth, out of earth's atmosphere, to a lunar orbit, to the lunar surface, as it landed, as the door opened, as Neil Armstrong became the first human being to walk on the moon. In that same edition, we also carried stories that happened in your own neighborhood. After the press is started the news does not stop. Some stories are updated as the press is running.
Story is updated and the press rolls again.
This explains why there are times when you have looked at an earlier edition and the paper is different than some other reader. We can't put an updated story in the newspaper, until it happens. When the newspaper is being printed it comes out on a conveyor belt to the next stage of your newspaper. The distribution department bundles up these papers. They say a picture is worth a thousand words.