This movie is long, and feels every bit of it's run time. I was looking forward to it, but think it was a bit of a mess. There are a lot of characters that are introduced but then you don't really get to know them, only to have them referred to in (long) talking scenes and I wasn't always sure who was being referred to. This isn't the story of inventing the atomic bomb. It's a political intrigue piece anchored in part on Robert Downey Jr s character who I didn't really know or care about. This movie certainly thinks it's important, but I just didn't get it. Did I mention it is very long?