 Okay, so Descartes says that knowledge is what you can believe with certainty. Okay, cool So right now you're sitting watching this video You're using what you see and what you hear to form beliefs about the world in front of you. Great Can you trust your senses on this matter? All right, it's hard to say. Well, I'm looking right at the phone or I'm looking right at the computer Is there any way that you can there's any way that you could trust your senses here? Or more to point can you trust your senses in every way? With this question So according to Descartes, here's the question. Can you trust your senses?