Good find, thanks for sharing it with us!
To keep these valuable resources together, please move this like to a post in the thread quoted below?
The List(2) [Overview] The one thread to link them all - Arguably the most comprehensive list of education-related links and resources in this entire Forum. It's locked, it should be raised to the rafters - sticked as a banner at the top of the board!
There are a few threads in this Beginners & Help board that serve as a single collection of great resources for Beginners. Your link is sure to get lost after a day if you don't add it to the thread quoted above.
Thanks!