Elon Musk thinks we are most likely living in a Simulated Reality

[LunaSea]

8. Probably not.

But now researchers say they've sussed out the whole situation for us. Theoretical physicists Zohar Ringel and Dmitry Korvizhini, who are based at Racah Institute of Physics Hebrew University in Israel and Oxford University in the United Kingdom, claim to prove the concreteness of our reality in a recent Scientific Advances study.
To understand what they found, it helps to first recognize what a computer is: it's essentially a machine that performs calculations. In order for a computer to simulate reality, then, the machine would need to have enough power to actually create the phenomena that we experience within its simulated environment. What the researchers discovered, however, is that storing the information required to simulate certain behaviors of even a couple hundred electrons would take more atoms than exist in the universe. For better or for worse, this world is real. Probably.

https://www.popsci.com/quantum-hall-computer-simulation

"Physicists have pointed out that quantum physics makes this incredibly unlikely, given electrons and atoms aren't tiny balls whizzing predictably through space."

https://www.sciencealert.com/quantum-complexity-rules-out-our-universe-as-a-computer-simulation