deletions | additions       diff --git a/innovations.tex b/innovations.tex  index 9d844c1..9635db4 100644  --- a/innovations.tex  +++ b/innovations.tex 
...
Figure~\ref{f.sample-datasets} illustrates an in-class \ipython\ exercise that was used to illustrate the $\chi^2$-test. The students use the notebook to generate fake datsets, compute $\chi^2$ for those datasets, and then answer questions about their findings. When finished, the students upload their \ipython\ notebooks to a course dropbox for grading.  \subsection{Regular Encounters encounters  with "Real" Data "real" data  and Observatory Archives} observatory archives}