How do we know we don't exist in a computer simulation?

I am thinking that even if we did, it would not be possible to tell one way or another.

The double slit experiment has been cited by advocates of this theory (Musk being one advocate) as being proof of our simulated lives.

Apologies if this has been debated before, but could not find any thread on this subject on a search, but that might just be me lacking good search skills.

via International Skeptics Forum https://ift.tt/5HfTcSi