@@ -189,3 +189,7 @@ like advanced interactive visualizations.
 * [Creating Presentations with Jupyter Notebook](http://www.blog.pythonlibrary.org/2018/09/25/creating-presentations-with-jupyter-notebook/)
   shows how to make slides out of your cells so you can present your
   work like a traditional presentation.
+
+* The number of open source Jupyter Notebooks on GitHub is exploding and
+  [this post attempts to estimate the growth](https://kyso.io/KyleOS/nbestimate)
+  using Python, [pandas](/pandas.html) and a scraped data set.
@@ -40,7 +40,11 @@ during Python software development as part of a programmer's
   command. There is also a great follow up post called
   [Ten MORE Things I Wish I'd Known About Bash](https://zwischenzugs.com/2018/01/21/ten-more-things-i-wish-id-known-about-bash/) 
   that covers new topics such as on-the-fly command re-execution using the 
-  carrot character.
+  carrot character. The 
+  [Seven Surprising Bash Variables](https://zwischenzugs.com/2019/05/11/seven-surprising-bash-variables/)
+  post continues the series by examining built-in variables such as
+  `PROMPT_COMMAND`, `CDPATH` and `REPLY` which can simplify your
+  scripts by using values that Bash already has stored for you.
 
 * Google's [Shell Style Guide](https://google.github.io/styleguide/shell.xml)
   covers how to write consistent, maintainable shell scripts, which is 
 
@@ -143,3 +143,8 @@ configure and start using MongoDB with Python.
   part of the series shows how to set up the 
   [development environment](/development-environments.html) required
   for working with Mongo.
+
+* [Testing MongoDB Failover in Your Python App](https://scalegrid.io/blog/pymongo-tutorial-testing-mongodb-failover-in-your-python-app/)
+  shows show to switch to a MongoDB replica in production failure scenarios
+  using the PyMongo library.
+