For regular (and new) readers, we've updated the site and are going to try a new approach to comments. Spammers have been a chronic problem, but we are now using "captcha" validation of comments. We hope this will allow our readers to comment on articles and keep spammers at bay.
Registration is no longer required to post a comment or to ask a question, but you will have to correctly identify one of those squiggly strings of characters before hitting the submit button on your comment.
Best regards,
Andrew