Ask HN: How are submissions ranked?

What determines ranking of submissions on HN? I've seen a lot of odd rankings, but normally a story that is higher is either newer or has a greater number of points. Right now, the submission on the FCC request for comment on net neutrality is #70 (164 points, 70 comments) and a random paywalled story about a company I've never heard of getting more money than I dream of is #69 (7 points, 0 comments).

What would cause this ranking?