Let&#x27;s make it more complicated than history and personal experiences. How do you know that you are not a Boltzmann brain? It&#x27;s highly improbable, I&#x27;m not claiming it to be true. There is the smallest possible probability that I am the only one that has qualia and sentience. It&#x27;s a <i>philosophical</i> zombie for a reason: it&#x27;s a source of creative thought, not necessarily truth.