Update: Discussion has moved on to a new thread.
The load more comments links are getting annoying (at least if you're not logged in), so it's time for a new Harry Potter and the Methods of Rationality discussion thread. We're also approaching the traditional 500-comment mark, but I think that hidden comments provide more appropriate joints to carve these threads at. So as of chapter 67, this is the place to share your thoughts about Eliezer Yudkowsky's Harry Potter fanfic.
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: one, two, three, four, five, six. The fanfiction.net author page is the central author-controlled HPMOR clearinghouse with links to the RSS feed, pdf version, TV Tropes pages, fan art, and more, and AdeleneDawner has kept an archive of Author's Notes.
As a reminder, it's often useful to start your comment by indicating which chapter you are commenting on.
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:
You do not need to rot13 anything about HP:MoR or the original Harry Potter series unless you are posting insider information from Eliezer Yudkowsky which is not supposed to be publicly available (which includes public statements by Eliezer that have been retracted).
If there is evidence for X in MOR and/or canon then it's fine to post about X without rot13, even if you also have heard privately from Eliezer that X is true. But you should not post that "Eliezer said X is true" unless you use rot13.
Re: chapter 70...
A nice capsule summary of the problem with endorsing non-instrumental heroism.
That said, Hermione raises a decent question that gets lost by the end:
Dumbledore has a clear opinion on the matter, and he does have some credibility, but he isn't showing his work. And Hermione's skepticism seems warranted.
If Hermione is actually interested in finding out, it would seem that some experimentation is called for. I wonder if that will occur to her. (Presumably it will occur to Harry, but it's unclear that he cares.)
Perhaps, if she learns anything reliable about how to learn heroism, she could dedicate herself to training up the next generation of heroes. Write a book, or something.
Also, while I'm here...
I'm intrigued by the implications of this line.
On the face of it, while the lack of smoke is reasonable evidence of a Boundary Charm or equivalent, it's extremely weak (read: negligable) evidence that there was any Transfiguration involved. After all, when I cook chickens, I turn on a ventilator to keep smoke from escaping into the air, entirely for aesthetic reasons; it seems likely to me that even Great Googly Moogly wizards similarly don't care for getting smoke everywhere.
So... how do Flitwick, et al, get from "no smoke" to "Transfiguration"? What do they know here that I don't?
Well, if it was Transfiguration, it would be really important that none of the particles escape into the air. I think we're supposed to infer that there wasn't so much smoke as to be objectionable for its own sake--if there was visibly a lot of smoke, Harry probably would have noticed it behaving oddly, instead of having to rely on smell.