I was looking at the list of hot questions and I saw this:
Thinking someone was trolling, I clicked on the question, only to find that the offending word had changed to 'pseudoprime':
There was no edit history or record of anything being changed. I clicked back to check I hadn't misread it, but no - the question was just as I had remembered.
Shortly afterwards, I looked again, and the title had been corrected to 'pseudoprimes'. But there was still no record of the question having been edited.
What is going on here?