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I noticed, when clicking "close" on this question: Breakthroughs in mathematics in 2023, that when a question has been closed and re-opened, and you voted to close it previously, the dialog ...

Bountied questions cannot be closed: this prompted this meta-MO question. In the answer to that question, the reasons for this feature are explained (closure would shorten the bounty period, possibly ...

The following MO question Why is $O(n;k)$ not connected, and has four connected components? (revisions/timeline) had the following history had a detailed answer (a) has been closed as off-topic (by ...