Read the comments! You might learn something. I do all the time.
This is a long overdue reminder for everyone to read the comments whenever there are any. Not only might you learn something interesting, but it is also now the method I use to correct my frequent mistakes and remedy omissions. (Google Blogger made changes to their editing function that more or less forced me to do it this way. It's complicated.) Plus, lots of viewers know more than I do and post it in the comments. As a result of that, some worthy interactive discussions take place there. Try it.