https://medium.com/predict/et-may-not-be-what-you-think-927d64005a64
Such an ancient universe might have all sorts of aliens, monsters, ghosts & other entities.
https://medium.com/cantors-paradise/capturing-the-ghosts-of-the-universe-e12161a6fd5a
https://medium.com/cantors-paradise/cats-and-collapses-interpreting-quantum-mechanics-92ba6ca6c65b
https://thedigitallabyrinth.blogspot.com/search?q=quantum+mechanics