Serious Eats: Talk

What makes a topic "hot in talk"?

I can't figure out the criteria. Topics with 80+ answers don't make it to "hot" while others, with 3 answers, do. What's the deal with how what is "hot" is decided?

[I did a search for this but didn't locate an answer. If there is one elsewhere, please post the link for me. TIA]

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