Just jumping in here for a sec to answer a few questions.
Puzzler answers are coming. The answer template wasn't in the first round of migrations to responsive design. It'll be coming later this week. An obvious oversight on our part.
We did drop Disqus for commenting. Cost was one factor, and we also generally felt like, although some folks did comment (and thank you!) participation was very low overall. So, we want to try Facebook commenting, which has high levels of participation and no cost. Our focus is on making engagement as easy as possible for as many as possible visitors. Because comments were part of Disqus, they could not make the migration.
Over the course of the month, we'll continue to knock out bugs here. Stay tuned, and thanks for the feedback. We appreciate it!