after-the-fact edits to "Hormones Day 156"

A powerful reason for keeping my blog's source in Git, is that I feel less
guilty about making nontrivial edits to already-published posts (which already
have a publication date and often, like this one, are about a particular point
in time): it's clearer that I'm refining my expression rather than trying to
edit the past, when there's an easily-accessible log of what changed and when.