One fun thing about keeping my lab notebook in digital form with IPython Notebooks is that I can flip through my old work so easily. Did I say fun? I meant scary, and sometimes depressing. But yes, also fun.
For example, two years ago, I was working on some projects that are still not wrapped up today, and I was doing a lot of prep for the first edition of my now re-titled “machine learning for health metricians” class.
Hey that includes the answer to [a question someone just asked on stats.stackexchange](http://stats.stackexchange.com/q/149801/18291)