A replication of a 2023 neuroscience study on brain entrainment and learning found that the original effect likely doesn't exist, revealing how the study obscured key issues through statistical averaging and highlighting how AI tools are democratizing scientific scrutiny. Longer summary

Sasha Putilin received an ACX grant to replicate a 2023 study claiming that flickering lights synchronized to individual brain rhythms could boost learning speed threefold. The $32,000 replication with 12 participants (versus 80 in the original) found no such effect. Upon examining the original data more closely, Putilin discovered the apparent effect was driven entirely by a few participants with large negative learning rates (getting worse over time) who happened to all be in one experimental group. The original study had obscured this pattern by presenting averaged data rather than individual results. Putilin argues this exemplifies 'cargo-cult statistics' where researchers mechanically apply statistical rituals without critically examining underlying data. The post concludes by suggesting AI tools are democratizing meta-science, enabling anyone to audit published research that previously required expert-level effort. Shorter summary

Scott Alexander's April 2026 links roundup covers diverse topics including Venn diagram complexity, flag desecration laws, AI developments, political analysis, scientific studies, and various cultural curiosities. Longer summary

This monthly links post compiles interesting articles, studies, and observations from across the internet in April 2026. Major themes include AI progress and policy (including discussions of AI alignment, capabilities, and regulation), political developments (Trump administration actions, election analysis), scientific findings (from evolutionary psychology to medical treatments), and various cultural oddities. Scott provides brief commentary on each link while noting that he hasn't independently verified all claims and that commenters typically find errors in a few links per post. Shorter summary

Scott Alexander announces the winners of ACX Grants 2024, covering a diverse range of projects from medical research to policy advocacy. Longer summary

Scott Alexander announces the results of the ACX Grants 2024, detailing the winners and their projects. The grants cover a wide range of areas including medical research, technology development, policy advocacy, and scientific studies. Scott explains the selection process, acknowledges contributors, and mentions future plans for the grants program. He also discusses how Manifund will handle payments and create an impact market for unfunded projects. Shorter summary

Commenters provide additional context and debate points from Scott Alexander's review of a Putin biography, covering Putin's rise, the author's objectivity, and comparisons to US politics. Longer summary

This post summarizes comments on Scott Alexander's review of a Putin biography. The comments provide additional context and perspectives on Putin's rise to power, question the objectivity of the book's author Masha Gessen, suggest Putin may be slightly less bad than portrayed, discuss Putin as a culture warrior, and express concern about the potential for US intelligence agencies to undermine democracy. Key points include the importance of Russia's economic collapse in the 1990s for Putin's popularity, debates over Gessen's bias and reliability, alternative explanations for some seemingly suspicious events, Putin's alliance with the Russian Orthodox Church, and discussion of whether US agencies like the FBI/CIA could potentially act in ways similar to Russia's FSB. Shorter summary