How come the categories change order?

I have noticed that each time I sign on, the categories are in a different order. Sometimes Nature Talk is first, sometimes General is first. Sometimes Nature Talk is second, sometimes it is last. Is there a reason for this, or does it happen randomly?

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Ordered chronologically by comments. So whatever the most recent reply is on any post, its category moves to the top, second-most recent reply has its category in second spot, etc

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