Brilliant observation. Dynamic systems like this are rarely a cut-n-done. Like the study of ozone, with it's seven counter intuitive steps, it is all an evolving study.

It also proves the worth of just simple studies over a long period of time. Science used to do a lot of that, and it was very interesting, as many appear on hacker news, but now it seems that cut-n-done grab more popular news.

It also bears the question: what longitudinal studies are popular here besides this one, and retro computing?