A collection of interesting links spanning architecture, science, politics and economics, with commentary on studies about lithium, lead exposure, minimum wage, and free speech. Longer summary

This is a links post where Scott Alexander shares various interesting articles and studies from around the internet. It covers a wide range of topics including architecture, science, politics, economics, and social issues. Notable items include a study showing lithium in drinking water may not have significant effects, research about the lead-crime hypothesis, discussions about minimum wage studies in Seattle, and various pieces about free speech and campus politics. Shorter summary

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. Longer summary

Scott Alexander discusses potential biological explanations for historical trends in crime rates. He provisionally accepts that crime may have increased from 1850 to 1980, contrary to his previous belief. He then explores three biological factors that could explain this trend: lead exposure, omega-6 fatty acid consumption, and lithium levels in water. Scott argues that increased lead exposure from industrialization, a dramatic rise in omega-6 fatty acid consumption, and decreased lithium in water due to modern purification methods could all contribute to higher crime rates. He presents evidence linking these factors to aggression and crime, including studies on dietary supplements reducing violence in various populations. Shorter summary