There currently is a problem with the commenting system, with some readers reporting comments not showing up. While the site may indicate some number of comments on a post, new comments are not visible on the post’s page. (I can see them as an administrator for the site, but at least some readers cannot.) I’m looking into what the cause of this is, but in the meanwhile one fix appears to be for the reader to switch the ordering of the comments from “oldest” (the default) to “newest.” The arrow in the image below (screenshots of the latest Mini-Heap post) shows where you click to do this. As you can see, the site indicates that there are 5 comments, but the fifth one is only visible once the view is switched to “newest.” Thanks to Daniel Dennett for inadvertently making the problem known to me. With luck, I’ll be able to resolve it soon.