The Acrobat and the Flea -- The Unexplored Science in Stranger Things

I just finished watching what is available of Stranger Things Season 4, and planning to watch the rest tonight.  I've been meaning to comment on the show for a while.  There are a lot of really neat ideas present in the series, that sadly I don't think get fleshed out as much as they could have been.

I was inspired to finally start writing some commentary by a scene near the end of vol 1 of season 4.  That is your spoiler warning.