What is the meaning of the numbers in the leftmost column: $94$, $70$, $54$, ...? Uncharacteristically, neither hovering nor clicking reveals the meaning.
The answer can be found here:How do the "arbitrary hotness points" work on the new Stack Exchange home page?, and in the question linked to on that page: What formula should be used to determine "hot" questions?. It takes a reddit-type formula (taking logs of scores) and divides it by its age, with quite a few other things thrown in.
It has it's opponents:Don't display arbitrary hotness points.