Scott Alexander reviews the evidence for declining sperm counts, discussing major studies, criticisms, and potential causes, while remaining uncertain about the true extent and reasons for any decline. Longer summary

Scott Alexander examines the evidence for declining sperm counts worldwide, discussing the major studies, potential causes, and criticisms of the hypothesis. He explores the methodology of sperm count studies, regional variations, possible explanations like plastics and pesticides, and animal data. While acknowledging the noisy data and potential confounders, he concludes that there's suggestive evidence for a decline but remains uncertain about its magnitude and causes. Shorter summary

Scott Alexander cautions against basing opinions on limited research, using examples from medicine and economics to show how cherry-picking studies can lead to opposing conclusions. Longer summary

Scott Alexander warns against relying on a single study or a limited selection of studies to form opinions on complex issues. He illustrates this with examples from medical research and the minimum wage debate, showing how cherry-picking studies can lead to opposing conclusions. The post emphasizes the importance of considering the full body of evidence, including meta-analyses and expert opinions, while also being aware of potential biases in research and reporting. Scott concludes by advocating for skepticism and thorough investigation when evaluating claims backed by scientific studies. Shorter summary

Scott shares a collection of interesting links covering various topics from American chestnut restoration to scientific findings, political events, and cultural observations. Longer summary

This is a Links post where Scott Alexander shares and briefly comments on various interesting news and findings. The post covers diverse topics including the genetic engineering of American chestnut trees, revelations about Dr. Strangelove's accuracy, malaria eradication efforts, scientific studies on topics like exercise and weight loss, and cultural observations. Scott provides his characteristic analytical commentary on each item, often highlighting surprising connections or ironies. The post maintains a mix of scientific, political, and cultural topics, with Scott's commentary ranging from serious analysis to humorous observations. Shorter summary

Scott Alexander examines political tribalism in America, arguing that people often claim tolerance while harboring strong prejudices against their outgroups. Longer summary

Scott Alexander explores the concept of outgroups and ingroups, arguing that people often claim to be tolerant of all groups except their perceived outgroup. He suggests that in modern American society, political tribes (Red and Blue) have become more significant than traditional demographic divisions. The essay analyzes how these tribes interact, criticize each other, and sometimes engage in self-criticism that may actually be veiled attacks on the opposing tribe. Alexander ultimately reflects on his own biases and the difficulty of genuine self-criticism and tolerance. Shorter summary

Scott Alexander critiques social justice terminology, arguing that words like 'privilege' and 'racism' are used as weapons rather than tools for understanding. Longer summary

Scott Alexander critiques the use of social justice terminology, particularly words like 'privilege' and 'racism'. He argues that these terms are often used in a way that differs from their stated definitions, serving as weapons to shut down debate rather than as tools for understanding. He uses the concept of 'motte-and-bailey doctrine' to explain how social justice advocates switch between defensible and indefensible positions. The post ends by comparing this behavior to a hypothetical government conspiracy, suggesting that the way these terms are used reveals their true nature as tools of social control. Shorter summary