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Now your readers can: \begin{enumerate}  \item  \textbf{Launch IPython} directly in their browsers (by clicking on the link in the bottom left of the figure block), block);  \item  see your annotated data and code, code;  \item  test it, and it;  \item  adjust it to their heart's content. \end{enumerate}  Beyond the obvious advantages this provides for streamlining the scientific process, imagine implementing this to facilitate classroom learning or centralizing repeated analysis in a lab setting. What's more, it gives you a place to be very descriptive with your code. In the predator-prey modeling example below, a detailed walk-through is given in the IPython Notebook. The hope is that anyone so inclined could modify or fork it, perhaps adding a third organism or some other environmental constraints. Or, if they had some ecological data, to test to see how well the model fit it.