The policy
We correct in place rather than quietly re-editing. When a published article changes in a way that affects what it claims, three things happen: the article is fixed, a dated note is added at the foot of that article saying what changed, and the correction is listed here.
Typographical and formatting fixes do not get a note. Anything that changes a fact, a figure, a citation, or a conclusion does.
The log
There are no corrections to report.
Nothing on this site has been published long enough to need one. When that changes, this page becomes the record.