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Currently the way I share my notebooks is that I export them to html and put them on my site, for example -- [http://abhirag.in/articles/train_of_thought_1.html] but sometimes I wish I could share a notebook backed by a running environment which others could edit and run, that is my use case. Right step towards reproducibility of results I would say.

it takes any iJupyter notebooks in the repo and makes the whole thing a versioned, reproducible cloud computing environment.

a major use-case is for scientific papers and data analyses

I can echo that!