The examples for searching Wikipedia are not working for me. Take for instance Cell 1, Chapter 6. My execution is aborted with Http Error 403: Forbidden. When I modify the code only by pointing to my own website rather than Wikipedia, the code works. I experimented on some other Wikipedia examples in the book and had a similar result. Since the book relies heavily on the structure of Wikipedia in many code examples in many chapters, the possibility that Wikipedia has introduced new barriers for the book's Wiki scrapers merits attention. The author has chapters on how to work around barriers from web servers but, to my knowledge, does not address the Wikipedia problem.