Your brain has been expertly removed from your body and is being kept alive in a vat of nutrients that sits on a laboratory bench.

The nerve endings of your brain are connected to a supercomputer that feeds you all the sensations of everyday life. This is why you think you’re living a completely normal life.

Do you still exist? Are you still even “you”? And is the world as you know it a figment of your imagination or an illusion constructed by this evil scientist?

Sounds like a nightmare scenario. But can you say with absolute certainty that it’s not true?

Could you prove to someone that you aren’t actually a brain in a vat?