You don't have knowledge if you don't have perfect recollection. Put in other words, if you cannot fully remember something, then you do not know it. We need to

You don't have knowledge if you don't have perfect recollection. Put in other words, if you cannot fully remember something, then you do not know it. We need to come terms with that and honestly I might be striking a nerve here because I'm triggering people's Dunning-Kruger. The state of knowing at any point in time is binary, which means that it is possible to un-know something that you used to know.