Scott's monthly roundup of interesting links covering AI policy developments, technology news, cultural observations, and scientific research from December 2025. Longer summary

This is Scott Alexander's monthly collection of links and commentary covering diverse topics. Major themes include AI policy battles (chip sales to China, regulation debates, political campaigns), startup news (Substrate fraud allegations, Tornyol mosquito drones), and scientific updates (COVID origins, Hitler's DNA, lactose intolerance). The post also covers cultural topics like the first millennial saint, Dimes Square commentary, and political polling about ideal Democratic candidates. Scott provides his characteristic mix of straightforward reporting, skeptical analysis, and occasional humor throughout the 53 linked items. Shorter summary

Scott Alexander criticizes Tyler Cowen and others for misrepresenting USAID's funding model, explaining how regranting through other charities is both necessary and effective despite seeming inefficient to outsiders. Longer summary

Scott Alexander criticizes a Marginal Revolution post by Tyler Cowen about USAID funding, where Cowen suggests that only 12% of funds go to recipients. Scott explains that this is misleading because USAID is not a direct charity but a funding organization that works through other charities. He details how the grant-making process works, defends the overhead costs, and points out that Cowen himself runs an organization (Mercatus Center) that does similar regranting. Scott particularly criticizes Trump and Rubio for misrepresenting these programs as wasteful, noting that programs like PEPFAR have saved millions of lives and have very low rates of unexplained expenses. Shorter summary

Scott Alexander presents evidence that the 2020 US homicide spike was caused by Black Lives Matter protests rather than the COVID-19 pandemic. Longer summary

Scott Alexander argues that the 2020 homicide spike in the US was primarily caused by the Black Lives Matter protests rather than the COVID-19 pandemic. He presents evidence on timing, demographics, police pullback, and comparisons with other countries and previous protests to support his claim. The post criticizes media coverage for attributing the spike to complex factors or the pandemic, suggesting a bias in reporting. Shorter summary

Scott Alexander argues that, contrary to his reputation as an isolationist, Trump's statements suggest he may be more likely to engage in military interventions than Clinton, who represents a more predictable foreign policy approach. Longer summary

Scott Alexander examines claims that Trump is an isolationist and safer choice than Clinton regarding foreign policy. He argues that Trump's statements and past positions suggest he may be more likely to engage in military interventions. Alexander analyzes Trump's statements on ISIS, Syria, Libya, Iraq, Iran, and North Korea, finding many hawkish positions. He discusses Trump's criticism of NATO and international trade agreements, suggesting this could destabilize the post-WWII peace. Alexander then examines Clinton's positions, arguing they are more moderate and predictable. He concludes that while Clinton's foreign policy isn't perfect, she represents a lower-variance, more stable choice compared to the unpredictability of Trump's potential actions. Shorter summary

Scott Alexander examines the relationship between gun ownership and homicide rates, finding a likely causal link but noting it's not the main factor in the US's high murder rate. Longer summary

Scott Alexander analyzes the relationship between gun ownership and homicide rates in the US, critiquing misleading statistics and conducting a more rigorous analysis. He finds that while there is likely a causal relationship between gun ownership and homicide rates, it's not the primary factor explaining the US's high murder rate compared to other developed countries. He tentatively concludes that gun control measures similar to Australia's might be beneficial, but emphasizes the need for further research. Shorter summary