Do your ever have the feeling that your entire reality is just a momentary hallucination inside a randomly formed space brain? If so, then this is the podcast episode for you! In this episode of Stuff to Blow Your Mind, Robert Lamb and Joe McCormick discuss the existential nightmare of Boltzmann brains, a thought experiment that questions the nature of self and cosmos. Plus, expect some discussion of Descartes’ evil demon, brain in a vat and the Hindu concept of Māyā.