I've come to accept the fact that if you post some random topic in HN, within 24 hours an expert in the field will be in it if it starts to get a lot of traffic

I've come to accept the fact that if you post some random topic in HN, within 24 hours an expert in the field will be in it if it starts to get a lot of traffic. A recent one that comes to mind is a thread that was talking about nuclear reactors, within a few hours (I think within the first hour) someone that actually designs nuclear reactors for a living was in the thread clearing up misconceptions and answering questions.