world is also not random. It is somewhere in between. That's where the complex system is. Complex systems argue that this is not a purely predictable system. At the same time it is not a random system either. So everything that you've learned in school now is really not becoming very useful because everything you learned is essentially either based on some classical physics which is deterministic equations or statistics. But we're arguing that for complex system neither will work. You need a combination of these two. Then you come with this. This basically two scientists in 1973, they were telling you the search for scientific basis for confronting problems of social policy is bound to fail. And this is a very classical paper really written in 1973 cited over 10,000 times now. So, is this wicked problem? Yeah, they were very brilliant, two young assistant professor from Berkeley in 1973. So what they were telling me that when you are confronted with complex problems, we don't talk wicked because wicked I don't like this word, but they use wicked. But wicked essentially in that term is very similar to what we call complex. And these are interconnected problems. These are interdependent problems. There is simply no way to do cause and effect, and particularly when they are a social policy. Then came this lady really from here Wellesley, she was an economics professor and a chair, she said you can't take politics out of this analysis. Now you have three things. You have physical systems, you have social system