What is the difference between this and <a href="http:&#x2F;&#x2F;nbviewer.ipython.org" rel="nofollow">http:&#x2F;&#x2F;nbviewer.ipython.org</a> or <a href="https:&#x2F;&#x2F;try.jupyter.org&#x2F;" rel="nofollow">https:&#x2F;&#x2F;try.jupyter.org&#x2F;</a>. I guess it was built using <a href="https:&#x2F;&#x2F;github.com&#x2F;jupyter&#x2F;tmpnb" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;jupyter&#x2F;tmpnb</a>? If so, that must be so generous for the owner offering free compute.