Entertaining, enjoyable ... till change of actor This is one of the rare series which I watch with my husband. I have no understanding of science, my husband does. We both enjoy the show, although of course, it is obvious that it could have been much better. The opening scene is a disgrace and not necessary at all. I think the series gives you a lively glimpse of history. What a curse it is to have been born at a time when you had to go through the 2 world wars. What really annoyed us terribly - and I see from the other reviews that other people felt the same way - is the totally illogical change of actors in the middle of the series. We got used to Johnny Flynn playing Einstein (we did not know him beforehand). We enjoyed his acting. He grew on us with each episode. Suddenly at the Armistice when Einstein is supposed to be 39, here comes Geoffrey Rush who is 66!! We were so shocked, we could barely continue to watch. The movie industry does not know how to make an young actor age?! No, really this is totally ridiculous. In addition, most of the other characters except for Elsa and Mileva (no similarity whatsoever with young Mileva who was such an excellent actor) remain the same! What poor judgment!