Scott responds to various reader comments on his article about having children despite climate change, addressing critiques and expanding on several points. Longer summary

This post highlights and responds to various comments on Scott's previous article about having children despite climate change concerns. It covers topics such as the sincerity of climate concerns, political implications, carbon emissions by location, the severity of climate change impacts, and arguments for and against having children in the current climate context. Scott engages with these comments, offering additional insights, corrections, and reflections on the original arguments. Shorter summary

The post explores a controversial theory linking saturated fats to weight control, critically examines the evidence, and discusses the paradox of historical vs. modern diets and obesity rates. Longer summary

This post discusses the history of obesity in the US and explores a controversial dietary theory that blames the switch from saturated to unsaturated fats for the obesity epidemic. The author first presents the theory, which suggests that high saturated fat diets might be beneficial for weight control. However, in the second part, the author critically examines the evidence and finds it lacking. The post concludes by discussing possible explanations for the paradox of why modern diets seem to cause obesity while historical diets did not, despite the difficulty in finding a consistently effective weight loss diet. Shorter summary

An adversarial collaboration in verse examines Christmas, concluding that despite historical inaccuracies and economic inefficiencies, its social benefits are worthwhile. Longer summary

This adversarial collaboration between Cindy Lou Who and the Grinch examines the merits and drawbacks of Christmas. They discuss the historical inaccuracies of Jesus' birthdate, the myth of Santa Claus, and the economic inefficiencies of gift-giving. Despite these issues, they conclude that the social and emotional benefits of the holiday outweigh the negatives. The collaboration is written in rhyming verse, maintaining a lighthearted tone while addressing serious topics. Shorter summary

A vegetarian and meat-eater collaborate to analyze the impacts of eating meat, concluding that reduced consumption is beneficial but not as clear-cut as some might think. Longer summary

This post is an entry to the 2019 Adversarial Collaboration Contest, where a vegetarian and a meat-eater investigate the ethical, health, and environmental impacts of eating meat. They explore animal consciousness, factory farming conditions, human happiness set points, health outcomes, environmental effects, and costs of switching diets. They conclude that reducing meat consumption, especially chicken, is beneficial overall, but the case is not as strong as some vegetarians might assume. Shorter summary

A diverse collection of links covering recent studies, unusual historical events, technological developments, and various curiosities across multiple fields. Longer summary

This post is a collection of various links and news items on diverse topics. It covers studies on pornography's effects, unusual military proposals, charter schools' success, climate change predictions, animal rights, restorative justice in schools, parenting advice, sexual selection theory, AI-generated content, breastfeeding patterns, visualization of classical music, Soviet whaling, cancel culture, housing legislation, embryo screening, retractions of scientific studies, gene drives, drug pricing, UFO sightings, cryopreservation, air conditioning efficiency, genetic testing for medication response, social justice terminology trends, napping benefits, nootropics survey results, Bitcoin price surge, transformer architecture in machine learning, fact-checking errors in popular books, challenges to persistence research, fringe ideologies in Japan, AI progress on language understanding, climate change risks, and various other curiosities and scientific findings. Shorter summary

A collection of interesting links covering science, technology, culture, and economics, including updates on DNA malware, AI gaming, prison censorship, and various scientific studies. Longer summary

This is a link roundup post covering various interesting news and studies. Topics include DNA-encoded malware, AI in gaming, prison book bans, studies on therapy effectiveness, global inequality trends, and various scientific and cultural curiosities. The post follows Scott's typical link roundup format, providing brief commentary and context for each item, often with a mix of serious analysis and humorous observations. He covers both academic research and popular culture, maintaining his characteristic balance of intellectual rigor and accessibility. Shorter summary

A collection of interesting links covering a wide range of topics, from scientific studies and historical facts to current events and amusing anecdotes. Longer summary

This is one of Scott's regular link posts, collecting various interesting articles, studies, and facts that caught his attention. The topics range widely from scientific research (like PTSD in Roman soldiers and genetic studies) to historical curiosities (like Byzantine titles and the history of cell phones). He also comments on current events like Silicon Valley critiques and political developments. Some links are serious academic studies, while others are more lighthearted like the rules around shooting Bigfoot. Throughout the post, Scott adds brief commentary and context to help readers understand the significance of each link. Shorter summary

Scott Alexander refutes PZ Myers' race car analogy against genetic engineering for intelligence, showing that high IQ positively correlates with many beneficial traits. Longer summary

Scott Alexander critiques PZ Myers' argument against genetic engineering for intelligence, which uses a race car analogy to suggest optimizing for intelligence might trade off against other important traits. Scott shows that, contrary to this intuition, high IQ correlates positively with many desirable traits like longevity, height, and health. He explores possible explanations for this, including heterozygosity advantages, mutational load, and trade-offs with traits important in evolutionary history but less so now. Scott concludes that while caution is warranted, the race car argument is likely less of an impediment to genetic engineering than it might seem. Shorter summary

Scott Alexander examines tribalism, arguing that ideologies often serve as 'rallying flags' for tribes rather than defining their core identity. Longer summary

Scott Alexander explores the concept of tribalism, arguing that ideologies and beliefs often serve as 'rallying flags' for tribes rather than being the core of what defines them. He examines various examples including religious sects, disability communities, and online subcultures to illustrate how tribes form, develop, and sometimes dissolve. The post suggests that understanding groups as tribes with historical context rather than purely ideological entities can provide insight into many social phenomena and conflicts. 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

A curated collection of interesting links covering science, history, politics and culture, with brief commentary from Scott Alexander on each item. Longer summary

This is a collection of interesting links and news items curated by Scott Alexander. The post covers a wide range of topics, from scientific discoveries (like fungi in Alzheimer's patients' brains and psilocybin's effects on brain connectivity) to historical curiosities (like the Czechoslovak legion's journey around the world). Scott provides brief commentary and context for each link, often with a humorous or skeptical tone. The links also include political analysis, economics research, and various cultural observations, demonstrating the breadth of topics that interest the blog's audience. Shorter summary

Scott Alexander explores the potential link between falling testosterone levels and declining crime rates, finding the hypothesis intriguing but ultimately insufficient to explain observed crime trends. Longer summary

Scott Alexander explores the hypothesis that falling testosterone levels might be related to the secular decline in crime. He examines studies showing a significant drop in testosterone levels in American men from 1987 to 2004, and research linking higher testosterone to violent crime. However, he identifies several problems with this hypothesis, including timing discrepancies between testosterone decline and crime reduction, contradictory evidence, and the fact that crime is dropping in women at the same rate as in men. While intrigued by the potential connection, Scott concludes that the hypothesis doesn't fully explain the observed crime trends. He suggests further research, including studies comparing testosterone levels in violent criminals to the general population and proposing an examination of digit ratios in historical skeletal remains to track testosterone levels over time. Shorter summary

Scott Alexander critiques feminist stereotyping of nerds, arguing that nerds' social struggles are real and not simply male entitlement. Longer summary

Scott Alexander responds to Laurie Penny's article about 'nerd entitlement,' arguing that feminists often unfairly stereotype and shame nerdy men. He contends that nerds' social difficulties and pain are real, and not simply a result of male entitlement or privilege. Alexander criticizes the tendency to dismiss nerds' struggles and accuse them of misogyny, arguing this perpetuates harmful stereotypes. He calls for more understanding and nuance in discussions of gender, privilege, and social dynamics in nerd culture. Shorter summary

Scott Alexander investigates and humorously addresses a recurring search query about 'alien thickness', tracing it to a 7th-grade science assignment and offering guidance on solving the problem. Longer summary

Scott Alexander humorously addresses a recurring search query about 'alien thickness' that has been leading people to his blog. He traces the source to a 7th-grade science assignment from a school in Los Angeles. Scott explains that the question likely refers to an online simulation about alien phenotypes, which the students aren't aware of. He then proceeds to guide the students through the problem-solving process, explaining how to approach the question using logical deduction and test-taking skills. The post ends with Scott sharing a personal anecdote about passing an exam on a subject he knew nothing about, emphasizing the importance of test-taking skills. Shorter summary