On a page such as Material Organization Refactoring the Related Posts section only has one working link.

The others all point to:

http://teach.github.com/articles/title

Looks like fallout from posts using the same -title slug end like:

0002-01-01-title.md

Where otherwise it would benefit with a unique slug to help create the hyperlinks.

0002-01-01-pull-vs-fetch.md