"<a href=""https://www.youtube.com/watch?v=BCdV6BMMpOo&amp;t=47m23s"">47:23</a> "We have no way to prove that our sensory experiences correspond to an external reality."<br>Stolen concept fallacy. If you know what "external reality" is", you have identified it from what isn't. To make a claim that invalidates your senses while using it to identify observations, is a contradiction. You can't make a statement of fact that invalidates your senses, while using your senses to arrive at it. This statement also means you can never make an inductive statement or provide any proof, because how can you trust your senses? Anything this man says is irrelevant by that deduction. Typical platonic/kant/hume bullshit. I hope everyone sees this as nonsense and finds something better to listen to.