Since we were talking about quantum mechanics earlier, I figured I'd post where the cutting edge of research is right now, at the Institute of Advanced Studies in NJ.
https://www.quantamagazine.org/one-labs-quest-to-build-space-time-out-of-quantum-particles-20210907/
https://www.quantamagazine.org/how-space-and-time-could-be-a-quantum-error-correcting-code-20190103/
https://www.quantamagazine.org/20130917-a-jewel-at-the-heart-of-quantum-physics/
https://www.quantamagazine.org/physicists-discover-geometry-underlying-particle-physics-20130917
https://www.quantamagazine.org/there-are-no-laws-of-physics-theres-only-the-landscape-20180604/
https://www.quantamagazine.org/quantum-entanglement-drives-the-arrow-of-time-scientists-say-20140416/
https://www.quantamagazine.org/nima-arkani-hamed-and-the-future-of-physics-20150922/
https://www.quantamagazine.org/how-our-universe-could-emerge-as-a-hologram-20190221/
Also the end of the black hole information paradox, which is unexpected to say the least
https://www.quantamagazine.org/the-most-famous-paradox-in-physics-nears-its-end-20201029/
https://www.quantamagazine.org/netta-engelhardt-has-escaped-hawkings-black-hole-paradox-20210823/
https://www.quantamagazine.org/hologram-within-a-hologram-hints-at-solution-to-black-hole-information-paradox-20191119/
https://www.quantamagazine.org/one-labs-quest-to-build-space-time-out-of-quantum-particles-20210907/
https://www.quantamagazine.org/how-space-and-time-could-be-a-quantum-error-correcting-code-20190103/
https://www.quantamagazine.org/20130917-a-jewel-at-the-heart-of-quantum-physics/
https://www.quantamagazine.org/physicists-discover-geometry-underlying-particle-physics-20130917
https://www.quantamagazine.org/there-are-no-laws-of-physics-theres-only-the-landscape-20180604/
https://www.quantamagazine.org/quantum-entanglement-drives-the-arrow-of-time-scientists-say-20140416/
https://www.quantamagazine.org/nima-arkani-hamed-and-the-future-of-physics-20150922/
https://www.quantamagazine.org/how-our-universe-could-emerge-as-a-hologram-20190221/
Also the end of the black hole information paradox, which is unexpected to say the least
https://www.quantamagazine.org/the-most-famous-paradox-in-physics-nears-its-end-20201029/
https://www.quantamagazine.org/netta-engelhardt-has-escaped-hawkings-black-hole-paradox-20210823/
https://www.quantamagazine.org/hologram-within-a-hologram-hints-at-solution-to-black-hole-information-paradox-20191119/