The abstract is not paywalled. I understand that my comment may seem rude, but tokenadult's basically useless comment was in the first spot for a good half hour, above a better comment thread, until I posted and several readers downvoted it.

In my opinion, tokenadult abuses his high karma average somewhat too often. Here's how it works: if you have a high comment average, your comment sorts higher than others with a similar number of up-votes. So if you post early enough, before anybody has written anything very interesting, your comment will stick to the top. If it's even vaguely useful to the casual reader—you post an article abstract copied and pasted from the the submission, say—you can then hold down the top comment spot, garner a lot of up-votes, pad your average, and stifle a more meaningful discussion. Maybe you come along later and edit in some actual information.

I find it obnoxious, and I wish tokenadult would stop doing it. (And I really only commented because I accidentally upvoted him, prolonging his comment's contentless primacy.)