I have been thinking about this a lot lately as I have been having extremely vivid memories of certain things. I don't necessarily mean high school (though sometimes I do) but specific memories in general. They become so real it's mental time travel.
The growing block universe, or the growing block view, is a theory of time arguing that the past and present both exist, and the future as yet does not. The present is an objective property, to be compared with a moving spotlight. By the passage of time more of the world comes into being; therefore, the block universe is said to be growing. The growth of the block is supposed to happen in the present, a very thin slice of spacetime, where more of spacetime is continually coming into being. Growing block theory should not be confused with block universe theory, also known as eternalism. (Wikipedia)
You can read about it more here:
https://www.abc.net.au/news/science/2018-09-02/block-universe-theory-time-past-present-future-travel/10178386?utm_campaign=abc_news_web&utm_content=link&utm_medium=content_shared&utm_source=abc_news_web
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