Jost comments on Harry Potter and the Methods of Rationality discussion thread, February 2015, chapter 110 - Less Wrong Discussion
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While the Statute of Secrecy was not mentioned explicitly in book 1, it was mentioned many times that the wizarding world is a secret. Just to name two instances:
(Families of muggleborn witches and wizards will learn about the wizarding world, of course; but other muggles won’t.)
With the rat, it’s less obvious: I would even argue that the relatively frequent mention of Ron’s rat in book 1 is weak evidence for it not being a normal rat. Plus, there’s a scene during the train ride to Hogwarts, where the rat is smashed into a window pane violently: Would a normal rat survive this without any apparent damage? Possible, but rather unlikely, so that’s additional evidence for the rat being somehow magical. (Wizards being more resistant to force than muggles is mentioned several times in the same book, as is the existence of animagi.)
Regarding Azkaban: No mention in book 1, yes, but it is mentioned in book 2, before it started to play a major role in book 3.
Regarding the last point (the cloak being special): Well, it belonged to Harry’s father but he gave it to Dumbledore for savekeeping. That alone is evidence that this is not just a normal cloak with a simple charm on it, which you could just buy again, if you lose it. Ron even says that such an invisibility cloak is extremely rare and valuable.
Smashing a creature against a wall at a specific speed is dependent on the square/cube law, since the kinetic energy is proportional to the creature's mass, but that kinetic energy is being spread out over a proportionately greater cross-sectional area than a larger creature. That's why a cat can survive a fall from pretty much any height.
Thanks for keeping me honest, but I don't have the book available to me now either. If you can quote from a different language edition (especially German), that would help.
Without the book to review, what I relied on in my comment[^1] was this: When I first read it, I came away with the impression that there was no secret. I remember reading about Petunia's letter and concluding that the Evanses knew all about Witches and Wizards. (The differing reactions to them are like the attitudes towards Mutants in Marvel comics.)
[^1]: That, and checking the Wikia for first mentions.
Perhaps, primed by this, I missed later references to secrecy. (But that doesn't help with any comments by McGonagall in the prologue.) I do remember being disappointed (but understanding) with the secrecy in book 2.
Yes, certainly. In fact, I always thought that Hagrid's trip to Azkaban in book 2 was set up so that we'd know what the title of book 3 meant. (I knew that title before I read book 2.)
Here's the passage from chapter 1:
My rough, not-a-native-German-speaker translation:
I take from that that McGonagall doesn't expect the Muggles to know what it means that there are suddenly a bunch of owls everywhere, but that wizards everywhere nevertheless have a duty to make sure that Muggles don't see those sorts of things.
Thanks! (The translation is fine, btw.)
A few lines later, McGonagall states it even more explicitly:
(rough back-translation):
Here’s the quote from chapter 5, too:
rough back-translation:
Thanks again, that is all very clear, in either language. I have edited my wrong comment.
I've always wondered about that. You're in the middle of a deadly war, and consider yourself to be in such danger that you use a rare and powerful charm to make your house not exist for the uninitiated. Why do you give away an invisibility cloak, normal or unique, and why do you give it to someone who explicitly states "I do not need a cloak to become invisible"?