We have now converted the entire Pleura chapter into Topic format.
We continue to add new relevant books to the main page of each Chapter, with thumbnails of the book covers linked to Amazon. Our book sales have increased, suggesting that visitors find these links useful. What do you think?
We also are refining the Google Adsense links, by eliminating ads that may be offensive to our visitors. These ads only pay us when visitors click on them, and the total revenue is modest, so we are happy to listen to your comments and make appropriate changes. We are also still working on getting advertisements more appropriate to our audience, but this is more difficult than one would think. If you have suggestions, let us know.