Are we all just part of a computer simulation? Scientists are trying to find that out.

[Angrboda]

It's unclear what to think of this as its central claim, "In a few decades, computers will be able to simulate large chunks of the universe that would prove we are living in a computer model," is distinctly unclear. Exactly how this would prove we are living inside a simulation is not specified.

Hilary Putnam wrote an essay in which he claimed to refute the possible hypothesis that we are brains in vats. (Putnam, Hilary. From Reason, Truth, and History, chapter 1, pp. 1-21. .) I found Putnam's argument largely unpersuasive.