I refer you to Wachowski & Wachowski (1999)*, building on previous work including Descartes and A. J. Ayer.
To whit: humans can't either, so that's an unreasonable question.
More formally, the tripartite definition of knowledge is flawed, and everything you think you know has a Munchausen trilemma.
* Genuinely part of my A-level in philosophy