Revert changes made during live presentation
Revert changes made during live presentation

jrmontag/Data-Science-45min-Intros,jeffakolb/Data-Science-45min-Intros,fionapigott/Data-Science-45min-Intros,fionapigott/Data-Science-45min-Intros,DrSkippy/Data-Science-45min-Intros,fionapigott/Data-Science-45min-Intros,fionapigott/Data-Science-45min-Intros,DrSkippy/Data-Science-45min-Intros,DrSkippy/Data-Science-45min-Intros,jrmontag/Data-Science-45min-Intros,fionapigott/Data-Science-45min-Intros,jrmontag/Data-Science-45min-Intros,jrmontag/Data-Science-45min-Intros,DrSkippy/Data-Science-45min-Intros,jeffakolb/Data-Science-45min-Intros,jeffakolb/Data-Science-45min-Intros,jeffakolb/Data-Science-45min-Intros,jeffakolb/Data-Science-45min-Intros,DrSkippy/Data-Science-45min-Intros,jrmontag/Data-Science-45min-Intros