Scott Alexander examines recent studies on the Fraternal Birth Order Effect, finding evidence for a broader sibling birth order effect on homosexuality, though its exact nature and mechanism remain debated. Longer summary

Scott Alexander reviews recent studies on the Fraternal Birth Order Effect (FBOE), which suggests that men with more older brothers are more likely to be gay. He discusses three key studies: Frisch and Hviid's large-scale Danish study that found no clear FBOE, Vilsmeier et al.'s meta-analysis that questioned the statistical validity of previous FBOE claims, and Ablaza et al.'s extensive Dutch study that found a significant effect of older siblings (both brothers and sisters) on homosexuality. Scott concludes that while the FBOE hypothesis has been forced to evolve, the core idea that more older siblings increases the likelihood of homosexuality seems to stand, though the biological mechanism remains uncertain. Shorter summary

Scott Alexander discusses a genetic study that largely confirms historical American migration patterns described in 'Albion's Seed', noting both its confirmations and areas of confusion. Longer summary

Scott Alexander reviews a genetic study that analyzes the population structure of North America, relating it to David Fischer's book 'Albion's Seed' and the concept of American Nations. The study used 770,000 genomes to create clusters that largely confirm historical migration patterns described in these works. Scott notes how the genetic clusters match with New Englander and Pennsylvania Quaker migrations, and their westward spread. He expresses confusion about the Southern/Appalachian region's genetic divisions and disappointment that the study doesn't confirm some theories about West Coast populations. Overall, Scott sees this as an elegant example of hard science confirming historical speculation. Shorter summary

The post argues that 'non-shared environment' in twin studies is often misunderstood, encompassing more than just different experiences and potentially overestimating the impact of nurture on personality and life outcomes. Longer summary

This post discusses the concept of non-shared environment in twin studies, arguing that it's often misinterpreted. The author explains that the 50% attributed to non-shared environment in many twin studies isn't solely about different experiences, but includes measurement error, random chance, and biological factors. The post breaks down various components of non-shared environment, including measurement error, luck, biological noise, immune system differences, epigenetics, and genetic mutations. The author suggests that the actual impact of different experiences (nurture) on personality and outcomes may be smaller than commonly believed, citing a review by Eric Turkheimer. The post concludes by suggesting that this interpretation could mean nature is more important than previously thought, making social interventions more challenging and genetic engineering more tempting. Shorter summary

Scott shares and comments on various news articles and studies, covering topics from police tactics and Trump's campaign to behavioral genetics and dietary research. Longer summary

A diverse collection of links covering various topics, with Scott Alexander's commentary on each. The post includes news about politics, scientific studies, and cultural phenomena. Highlights include a discussion of police tactics against drug dealers, updates on Trump's campaign, studies about bombing in Vietnam, diet research, and behavioral genetics. The post maintains a light and sometimes humorous tone while discussing serious topics, with Scott adding his characteristic analytical perspective and occasional wit to each link. Shorter summary

A collection of interesting links from November 2014 covering science, technology, politics, and culture, with Scott's commentary and analysis on each. Longer summary

This is a links post collecting various interesting stories and articles from around the web. The post covers a wide range of topics, from scientific discoveries like saltwater crops and hover technology, to social issues like online harassment statistics and Ethiopia's economic growth. Scott provides brief commentary and often humorous observations about each link, while maintaining his characteristic analytical approach to evaluating claims and studies. Shorter summary

Scott Alexander uses an analogy between race and culture to argue that mathematical clustering arguments don't determine whether race 'exists' any more than they determine whether culture 'exists'. Longer summary

Scott Alexander discusses the concept of 'Eulering,' using complex math to debunk common sense ideas, and proposes 'Feynmaning' as a counter-technique. He applies this to the debate about race, comparing arguments against race as a biological concept to similar arguments that could be made about culture. He concludes that mathematical arguments about clustering don't determine whether race 'exists' any more than they determine whether culture 'exists,' and suggests that race doesn't have any extra reality beyond culture. The post uses an analogy between race and culture to challenge both those who claim race isn't real and those who claim it's more 'scientific' than culture. Shorter summary

Scott Alexander shares a diverse collection of interesting links and brief commentaries on topics ranging from pollution solutions to genetic discoveries and cultural differences. Longer summary

Scott Alexander shares various interesting links and brief commentaries on diverse topics. These include an Effective Altruism survey, innovative solutions to pollution, a unique thundercloud, eating habits of liberals and conservatives, a critique of cyberbullying, police body cameras, genetic discoveries related to intelligence, polio outbreaks, race and drug testing in hiring, cultural differences based on agriculture, China's economic future, and circular farms seen from airplanes. The post is a collection of brief, often unrelated observations and references to articles Scott found intriguing. Shorter summary