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Comments turned off on some posts

I've turned off comments on some, but not all, of our posts as part of the long defensive battle against blog-comment spammers/vandals. Sometimes it sure seems like we're trapped in a siege-war.

While all comments are moderated, it's still a constant chore to deal with all the spam attacks. The last couple weeks have been particularly bad.

I'm tempted to add captcha, but I'm not sure if the accessibility issues have been worked out yet.