I admit up front that I have a strong interest in this topic (relativity) but have only recently tried to better understand it. Professor Wolfson does a terrific job of keeping the explanations simple and easy to understand. He moves along quickly, so the listener needs to stay focused. But I really enjoyed listening to this and professor Wolfson makes it easy to listen to. If you want to have a basic understanding of relativity, this is a great audio book to start with. I strongly recommend this.