Why is this link being pushed down Hacker News front page if you compare it to this link Perl6: Unary Sort. Both posted 9 hours ago. One with 486 points, the ot

Why is this link being pushed down Hacker News front page if you compare it to this link Perl6: Unary Sort. Both posted 9 hours ago. One with 486 points, the other 55 points? Because the former did not receive many points in say last hour?