I think I can safely say that nobody understands quantum mechanics. So do not take this lecture too seriously, but just relax and enjoy it. I am going to tell you what nature behaves like. If you will simply admit that maybe she does behave like this, you will find her a delightful, entrancing thing. Do not keep saying to yourself, if you can possibly avoid it, ‘But how can it be like that?’ because you will get down the drain, into a blind alley from which nobody has escaped. Nobody knows how it can be like that.