Non-verbal actions

I was watching the History Channel a couple of days ago and it talked about people in our history and what non-verbal actions certain presidents and political figures did while giving speeches.  The one that stayed in my mind was when they were talking about Richard Nixon.  They said that to be effective in judging if people are acting out of the ordinary it is better to study them and see what it is that these people would consider normal non-verbal actions for the president.  The part that they showed was when Nixon was answering questions from reporters regarding the Watergate Scandal.  In this the reporter asked Nixon a question and
Nixon put his hands behind his back as if he was open for questions and suggestions, but then on further review they saw that he was also rubbing his hand with the other, this the communication experts said was him comforting himself or reassuring himself to the questions.  The next part of this show that stuck out in my mind was when they said that many of political people were coached in nonverbal responses.  This part showed Hillary Clinton giving a speech and after she was done and the crowd was cheering she pointed into random parts of the crowd, and even though she did not know anyone in the crowd where she was pointed and saying "thank you," it made the crowd feel like she was talking right to them because they did not know who exactly she was talking to.  These examples were just the one that stuck out in my mind the most because I  thought it was very interesting and I learned quite a bit from these especially that the political people were so coached on nonverbal and verbal responses.