Why doesn't the "Today in History" thread show up in threadsearch?

[Riemann]

I put “Today In History” in quote marks in the basic search box (no advanced tuning of the search) and this was the first hit, is this what you mean?

Today in History

Post an event in history that happened on the day/month of your post. Starting Day is July 10th, so until your calendar (or another poster’s calendar) turns to July 11th, you can only post events of July 10th. Once a playing poster who is actually on July 11th (their time) posts for that next day, posts about July 10th are no longer allowed until next year. And so on through the year. In other words, once a legitimate new day post is made, the game is reset for that day. Therefore, if a new da…

ETA: it’s the first hit for “today in history” without the quote marks, too.