Scott explores the 'missing heritability' problem in genetics, where twin studies show traits like IQ and educational attainment are highly heritable but newer genomic methods find much lower heritability, analyzing various potential explanations for this discrepancy. Longer summary

The post examines the 'missing heritability' problem in genetics, where twin studies consistently show behavioral traits like IQ and educational attainment are substantially heritable (around 40-60%), while newer genomic methods find much lower heritability (around 15-20%). Scott reviews the history of behavioral genetics research, explains various study methodologies and their potential biases, and analyzes different hypotheses for this discrepancy. He examines whether twin studies might be flawed, whether newer methods might be missing important genetic effects, and whether educational attainment might be an unusually problematic trait to study. While acknowledging remaining mysteries, he tentatively concludes that twin studies are probably largely correct and that newer methods may be missing rare variants and genetic interactions. Shorter summary

Scott Alexander examines Richard Lynn's controversial national IQ estimates and argues they are actually consistent with environmental rather than genetic explanations of IQ differences, while explaining common misconceptions about what low IQ means. Longer summary

Scott Alexander discusses Richard Lynn's controversial national IQ estimates, which show very low IQs in some countries like Malawi. The post addresses two main objections: that such estimates are racist, and that they seem to contradict common sense observation. Scott argues that Lynn's findings are actually more consistent with anti-racist environmental explanations of IQ differences than with genetic ones, given the huge gaps in nutrition, healthcare and education. He then explains why normal people with low IQ appear more functional than those with similar IQs due to specific syndromes, since the latter have additional deficits beyond just low IQ. The post concludes that Lynn's data suggests room for optimism about the potential impact of developmental interventions. Shorter summary

A diverse collection of news items, studies, and interesting facts from November 2024, covering topics from scientific discoveries to cultural phenomena. Longer summary

This post is a compilation of various news items, studies, and interesting facts from November 2024. It covers a wide range of topics including scientific discoveries, political events, technological advancements, cultural phenomena, and historical anecdotes. The post is structured as a numbered list, with each item briefly summarizing a piece of news or information. Some notable items include a new schizophrenia drug approval, YouGov polling results on various historical figures, findings on genetic IQ changes over time, and updates on AI technology and its implications. Shorter summary

Scott Alexander's monthly links post covers diverse topics from AI developments and genetic research to historical anecdotes and local news, with a mix of serious analysis and humor. Longer summary

This links post covers a wide range of topics, including recent research on the Flynn Effect, factors influencing fertility rates, genetic engineering, AI developments, political issues, historical anecdotes, and local Bay Area news. Scott highlights interesting studies, cultural phenomena, and recent events, often with a humorous or ironic tone. He touches on subjects like universal basic income experiments, the formation of elite groups, and changes in political dynamics. The post also includes several visual elements like unusual architectural designs and tattoos. Shorter summary

A collection of 47 diverse links and news items covering topics from religious practices to AI developments, with brief commentary on many items. Longer summary

This post is a collection of 47 diverse links and news items covering various topics. It includes discussions on religious practices, video games, political trends, scientific studies, AI developments, economic analyses, historical anecdotes, and cultural phenomena. The author provides brief commentary on many of the items, often with a mix of humor and critical analysis. The links range from academic studies and economic reports to quirky historical facts and contemporary cultural observations. Shorter summary