The narration in chapters 88 and 89 have left quite a bit of room for Weasley Twin shenanigans. They are referred to as "the twins" and "Fred or George" up until one gets beat up by the troll. Additionally, the twins gave a respectful nod to McGonagall's demand that they stay in the Great Hall; they could have stayed there the entire time. Harry might have been accompanied by, say, Future Fred and Further Future Fred during his broom flight. I am not sure what the use of this would be, but it might involve them being a hive mind.
This has got me quite convinced that Fred and Fred is going to happen. They are probably connected magically, rather than acoustically, so they might be able to communicate across time. This setup might create the time beacon Harry was wanting.
Or, maybe their connection does not link through time. Send a pair of Weasleys back in time. You now have 4 Weasleys. Wait not-quite-an-hour, and then send 4 Weasleys back in time… 4 Weasleys is twice the number of Weasleys. Are N Weasleys N/2 times as smart as 2 Weasleys? No. It is much more interesting if it is the...
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 90. The previous thread has passed 750 comments.
There is now a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system. Also: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17,18,19.
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: