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Posts are organized by category. There is a list of categories on the left side of the page. Click on a category that interests you to call up all the related posts. You can also use the search tool to find posts that mention a particular topic.
To join a discussion in progress, click on the title of the post that interests you and respond either to that post or to a particular comment. If you’re unfamiliar with using a “weblog,” you might want to check out the “sample posts” for a very brief introduction to this site. Note: your comments will not appear until approved by the site administrator. And to introduce a new post, you must be a designated author.