Of relevance to curriculum writers such as myself is a change in how Github redirects links to the same repo, if said link is to a Jupyter Notebook. It used to be that Markup like [Volumes](Volumes.ipynb), i.e. no path, just a Notebook name, would work in a Github repo. A student could jump from Notebook to Notebook, always in master. No longer. Now that link will take you to: https://notebooks.githubusercontent.com/view/Volumes.ipynb nbviewer (nbviewer.org), on the other hand, still works the old way, i.e. a link to another Notebook in the same repo pulls up that other Notebook. https://nbviewer.org/github/4dsolutions/elite_school/blob/master/Calc_with_P... (e.g. try Euler's Formula way at the bottom) My response has been to reiterate to students that if they want a smooth experience with one of my repos, the best option is to clone it and use it locally. That used to not matter as much. The next step is to create their own repos. On the up side, Github now renders Jupyter Notebook's embedded LaTeX much more successfully, removing one of the primary reasons to go to nbviewer in the first place. Kirby