Scott demonstrates that US crime rates are at historic lows using multiple data sources, then debunks the theories that this is due to reporting bias or improved medical care, before briefly discussing possible explanations for the decline.

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.

Scott Alexander questions the plausibility of multifactorial explanations for trends, using the US crime rate decline as an example, and seeks literature on comparing single-factor vs multi-factor explanations.

Scott Alexander explores biological factors like lead exposure, omega-6 fatty acids, and lithium levels as potential explanations for historical crime rate trends, particularly the possible increase from 1850 to 1980.

Scott Alexander debunks claims of effectiveness for Vancouver's 'Don't Be That Guy' anti-rape campaign, arguing that the reported crime reduction is likely due to normal statistical fluctuations rather than the campaign's impact.