So, in the image below, you can see that the article about the rather large phone bill is tagged as "Hot", with 27 comments while to article below has 70 comments and is not "Hot".
What, or who dictates whether a topic is "Hot" or "Not"?
It's determined by the amount of unique pageviews; once it reaches a certain threshold it becomes "hot".
On the other hand, when an article receives 60+ comments the background of the comment counter turns red. But the amount of comments does not affect the article going hot.
DAMNIT!
...And there's me thinking it had something to do with trolling...
Edit
If you notice this notice, You will notice that this notice isn't worth noticing.
(now that I've got that out of my system, sleep well, or good morning Neowin)