Incoming rant.

I'm pressing the "tweet" button as I type, and I'm typing as I think, so there's every possibility that this will drift into tangents and/or nowhere. Of course, that's true pretty much every time I start threading.

I know diddly-squat about physiology.

Friends and family who *do* know anything about physiology regularly mock my (apparently bizarre) theories of how bodies work.

I am not a trustworthy narrator when it comes to things like How Vaccines Work.

I know diddly-squat about epidemiology.

Unlike physiology, where I am firmly in the domain of Messrs. Dunning and Kruger, I've read enough about the subject to understand how little I know.

This is a complicated subject, where obvious truths are seldom either obvious or true.

I also know diddly-squat about public health policy.

Public *transportation* policy is way more in my wheelhouse. But this at least lets me make some useful analogies.

…I mentioned digressions? Yeah, I just started to write a very long digression about public transportation paradoxes, and it was taking away from the point I wanted to make.