Explorez tous les épisodes du podcast HPMoR and the Limits of Rationality
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Titre
Date
Durée
Ep. 9: Reciprocity, pt. 3 - Moonlight
01 Aug 2026
01:49:08
In the last part of chapter 7, Harry attempts to seduce Draco to the cause of Science via a moon landing picture. Unfortunately, that picture doesn't exist. The crew goes to the Sequences to learn how to actually change their minds.
CONTENT WARNING: this episode touches on eugenics and rape.
“"How are you coping with the end of the world?" journalists sometimes ask me, and I sometimes reply, "By remembering that it's not about me." They have no hope of understanding what I mean by this, I predict, because to them I am the subject of the story and it has not occurred to them that there's a whole planet out there too to be the story-subject. I think there's probably a sense in which the Earth itself is not a real thing to most modern journalists.
“The journalist is imagining a story that is about me, and about whether or not I am going insane, not just because it is an easy cliche to write, but because personality is the only real thing to the journalist.” "Eliezer's Unteachable Methods of Sanity," Eliezer Yudkowsky. LessWrong, 6 Dec 2025. https://www.lesswrong.com/posts/isSBwfgRY6zD6mycc/eliezer-s-unteachable-methods-of-sanity
“I think you are dramatically overestimating how difficult it was, back in the day, to accidentally or incidentally learn Scott's full name. I think this is the crux here.
Jake is correct: IQ is ordinally scaled. “A test score equal to the average of one’s age group defined an IQ of 100. [...] Thus an IQ score on the [Wechsler Adult Intelligence Scale] (a deviation IQ) is simply a reflection of an individual’s relative standing with respect to others of the same age. it is not an absolute score. In the jargon of psychological measurement theory, IQ is an ordinal scale, where we are simply rank-ordering people. There is no absolute zero for IQ, as there is for height or weight, and someone with an IQ of 150 is not twice as intelligent as another with an IQ of 75, in the sense that someone 6 feet (1.8 m) tall is twice as tall as someone of 3 feet (0.9 m). It is not even appropriate to claim that the 10-point difference between IQ scores of 110 and 100 is the same as the 10-point difference between IQs of 160 and 150 [...] To say that someone has an IQ of 130 is simply to say that their test score lies within the top 2.5 per cent of a representative sample of people of the same age.” IQ and Human Intelligence, N. J. Mackintosh. Oxfor University Press, 1998. https://archive.org/details/iqhumanintellige00mack/page/30/mode/2up
In the second part of chapter 6, Harry descends into multiple black rages, Yudkowsky finally demonstrates a good example of the planning fallacy, and a plot twist is introduced. Anthea is dispirited, Jake and Elisa are unimpressed, and a dog makes a cameo.
This episode spoils a plot reveal from later in HPMoR.
Content warnings: this chapter mentions child abuse.
In the first part of chapter 6, Harry enlightens McGonagall about the planning fallacy via an incredibly maladaptive coping mechanism. Elisa, Jake, and Anthea are forced to question the limits of authorial intent and why there are so many alleys in Diagon Alley.
Content warnings: we touch on Alzheimer's; medically assisted suicide, cryonics, and other end of life considerations; suicide; and mortality/death from about 0:50:00 to 1:05:45.
“Credibility and Incredulity in Milgram’s Obedience Experiments: A Reanalysis of an Unpublished Test,” Gina Perry, Augustine Brannigan, Richard A. Wanner, & Henderikus Stam. Social Psychology Quarterly, March 2020. https://journals.sagepub.com/doi/abs/10.1177/0190272519861952
In chapters 4 and 5, Harry becomes fabulously wealthy and meets Draco Malfoy. Anthea, Elisa, and Jake are joined by Ernie to discuss effective altruism, the fundamental attribution error, and being built different.
Citations and further reading:
Harry Potter and the Methods of Rationality, chapter 4: https://hpmor.com/chapter/4
HPMoR, chapter 5: https://hpmor.com/chapter/5
"Eliezer's Unteachable Methods of Sanity," Eliezer Yudkowsky. LessWrong, 6 Dec 2025. https://www.lesswrong.com/posts/isSBwfgRY6zD6mycc/eliezer-s-unteachable-methods-of-sanity
"ELI5: What is arbitrage and how do arbitrageurs make money?" r/explainlikeimfive, 27 Nov 2012. https://www.reddit.com/r/explainlikeimfive/comments/13wekw/comment/c77s5go/
"Effective Altruism." Lesswrong, 2 May 2024. https://www.lesswrong.com/w/effective-altruism
"Can one person make a difference? What the evidence says." Benjamin Todd. 80,000 Hours, accessed 22 Apr 2026. https://web.archive.org/web/20260219151243/https://80000hours.org/career-guide/can-one-person-make-a-difference/
"Sam Bankman-Fried on Arbitrage and Altruism (Ep. 145)," Conversations With Tyler. 9 Mar 2022. https://conversationswithtyler.com/episodes/sam-bankman-fried/
"An excellent collection of Fermi problems for your class," Kevin Cummins. Innovative Teaching Ideas, 14 Aug 2023. https://innovativeteachingideas.com/blog/an-excellent-collection-of-fermi-problems-for-your-class/
"The attribution of attitudes," Jones and Harris. Journal of Experimental Social Psychology, January 1967. https://www.sciencedirect.com/science/article/abs/pii/0022103167900340?via%3Dihub
"The "Fundamental Attribution Error" is rational in an uncertain world," Walker, Smith, and Vul. Proceedings of the Annual Meeting of the Cognitive Science Society, 2015. https://escholarship.org/uc/item/48d9b5qb#main
"Don't Revere The Bearer Of Good Info," CarlShulman. LessWrong, 21 Mar 2009. https://www.lesswrong.com/posts/tSgcorrgBnrCH8nL3/don-t-revere-the-bearer-of-good-info
Ep. 3: Stand By Me
15 Apr 2026
01:28:35
In chapter 3, Harry learns about Death Eaters, and the hosts rescue jokes from a burning podcast.
CONTENT WARNING: discussion of real life violence and sexual violence from 40:15-51:46. Continuing discussion of graphic fictional violence from 51:46 onward.
Citations and further reading:
Harry Potter and the Methods of Rationality, chapter 3: https://hpmor.com/chapter/3
Influence, Robert B. Cialdini. HarperCollins, 2007. https://dn710600.ca.archive.org/0/items/ThePsychologyOfPersuasion/The%20Psychology%20of%20Persuasion.pdf
In chapter 2, a woman turns into a cat. Anthea and Regina discuss the pros and cons of reasoning from first principles, the collision of the profound and the mundane, and a cool Bavarian.