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You might really enjoy looking into Neil Turok's cosmological theory if you haven't seen it:
https://insidetheperimeter.ca/a-mirror-universe-might-tell-a-simpler-story-neil-turok/
Started as a very elegant solution to the asymmetry of matter to antimatter, and by now he and his coauthors have found the theory fits a number of different unexplained open questions in cosmology and have testable predictions we'll probably start having answers to in the next decade.
There's been a recent head scratcher with this one too. While it is typically referred to as a variation of Wigner's friend, a recent experiment that was perhaps better described as a recursive Bell's Inequality found a similar set of three assumptions, one of which must be false:
https://www.science.org/content/article/quantum-paradox-points-shaky-foundations-reality
Then another recent "one of three must be false" was a mathematical paradox around quantum theory:
https://www.quantamagazine.org/frauchiger-renner-paradox-clarifies-where-our-views-of-reality-go-wrong-20181203/
You might enjoy some of these rabbit holes.