What are the "score" and "percent_rank" fields on the topics table?

I was exploring some data this evening and came across the score and percent_rank fields in the topics table. But it wasn’t immediately obvious to me what these fields are, how they are calculated and what they are used for. I can spelunk through the source code if necessary, but I thought I’d ask if anyone has the TL;DR; on that info close at hand first.

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AFAIK, those have to do with the Top page and the summary emails.

Factors include, Likes, views, activity etc.