Oh look its the physics knower. What do you mean cold fusion isn’t possible? Did you come up with the theory of everything and fail to mention it to the rest of us? We DONT KNOW what is possible. Science is not even 5% of the way towards figuring out the entire universe. Such a definite answer is in no way verifiable. You could say it’s not possible for us to do it right now. That’s true. But saying it’s entirely not possible is about as backed by evidence as your typical religious claim.