could it be a function of time and perspective and experience and that there's not really a method to know that quickly? Yes, so we'll get into something basically. I did not have a chance to discuss this with you. So we are basically making distinctions now between two types of facts and this is part of the discussion that we'll have today. So one thing that over time that we have learned this idea of scientific method and scientific facts. Another thing that basically we are coining and it has been used in social science for quite some time called social facts. And we are making a sharper distinction between these two right now. So what I argue really in this particular case that scientific facts are basically a particular type of facts. Those facts are verifiable, reproducible, replicable. Those will not depend on really perspective or notion. They may depend on methods over time but there is a way to get around this. That's the whole idea of scientific methods. We'll talk about that. Social fact, on the other hand, does not have to be true. Does not even have to be verifiable. It's just we believe. It's just that we accept it as reality. And that is fine too, and we have done many of this. For example, this whole idea of currency is a social fact. We give tremendous amount of value now to this something green called dollar. And whether I'm in Bangladesh or in Boston, doesn't matter everybody accepts it. Whether they believe in me