I just finished watching Einstein's Big Idea on tpt 17.
Despite the usual tpt acting I loved it! After seeing the special I had to learn more physics than what I currently know. So I did a simple web search for string theory. If you are or are not an expert on physics and love the ideas. Then maybe you want to know a good explaining site I found on string theory. (I am not, but could tell you everthing known about free fall).