In part 7, Michaelos observed that Dumbledore blames himself for Harry being left with his evil stepparents, and wrote the comment on Lily's musing on modifying the (D&D-style) Eagle's Splendor potion in her text book while she slept.
Ch 1. "And Lily would tell me no, and make up the most ridiculous excuses, like the world would end if she were nice to her sister, or a centaur told her not to - the most ridiculous things, and I hated her for it. ... "Anyway," Petunia said, her voice small, "she gave in. She told me it was dangerous, and I said I didn't care any more, and I drank this potion and I was sick for weeks, but when I got better my skin cleared up and I finally filled out and... I was beautiful, people were nice to me," her voice broke, "and after that I couldn't hate my sister any more, especially when I learned what her magic brought her in the end -"
Perhaps, the brighter Lily, child of the enlightenment, growing up in the technological optimism of the 60s had determined to help her sister, and minimize the risks as she understood them. Giving Petunia the potion being a major change in the time line. Dumbledore may have been trying to prevent that.
Hm. Quoted in the linked post is the fact that Dumbledore's suggested revision to the Potion of Eagle's Splendor (the one that would end up making the imbiber sick for weeks, as happened to Petunia) was, specifically, replacing blueberries with Thestral blood. Now where else has that come up recently?
...And Harry knew, now, that the concealment of the Cloak was more than the mere transparency of Disillusionment, that the Cloak kept you hidden and not just invisible, as unseeable as were Thestrals to the unknowing. And Harry also knew that it was Thestral bl
(The HPMOR discussion thread after this one is here.)
The previous thread is over the 500-comment threshold, so let's start a new Harry Potter and the Methods of Rationality discussion thread. This is the place to discuss Eliezer Yudkowsky's Harry Potter fanfic and anything related to it. The latest chapter as of 09/09/2011 is Ch. 77.
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, seven, eight. The fanfiction.net author page is the central location for information about updates and links to HPMOR-related goodies, 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: