He mentions "The fabric of reality" by David Deutsch. It's a very good book (IMO) and not primarily about multiple universes so don't let that put you off if yo

He mentions "The fabric of reality" by David Deutsch. It's a very good book (IMO) and not primarily about multiple universes so don't let that put you off if you think it's rubbish. He does a really good job outlining Popper's theory of science as explanation. Also one thing he notes is that it is really extraordinary that the universe gave rise to something that can understand it. We are the universe looking at itself and understanding it at a more and more fundamental level as time goes on.