Southern Italy is poorer than northern Italy because the Catholic Church never conquered it. And that's not a hot take, that's what the data says. Part 2 of our deep dive into how the Western church's marriage bans accidentally created modern psychology, and why understanding WEIRD culture matters for everything from trade to testosterone to trust. Not "quirky." Not "unique." Statistically, measurably, scientifically WEIRD (Western, Educated, Industrialized, Rich, Democratic). In Part 1, we covered how banning cousin marriage broke down clans. Now we go deeper into what happened next: charter towns, guilds, impersonal markets, monogamy lowering testosterone, and how commerce created moral norms without anybody planning for it. The church reached down and grabbed men by the testicles (that's an actual Henrich quote). Monogamy domesticated wild males, gave them kids, lowered their T, gave them a stake in the future. Crime rates dropped 35%. Meanwhile in China's one-child policy: 38 million surplus males, crime rates rose 14% per year 18 years later. This is Henrich's answer to Guns, Germs, and Steel. What you'll learn: 🤝 why southern Italy has the Mafia (kinship vs society) 🌾 rice farming in Asia = collectivist = non-WEIRD 🇨🇳 how Communist China in 1950 banned the exact same things the church banned a millennium before 💪 monogamy as a testosterone suppression method 🏛️ charter towns, guilds, universities as kin group replacements 🤝 how markets created interpersonal trust with strangers 📍 every hour closer to a town market = 15 percentage point increase in cooperation scores 🔄 impersonal markets reduce in-group sociality, increase prosocial behavior with strangers ✉️ the Republic of Letters and Europe's collective brain ⚙️ James Watt didn't invent the steam engine from scratch, he added a condenser 📚 why Enlightenment thinkers were just standing on the shoulders of a great society 🧬 cultural evolution shaped our genes, then institutions shaped our psychology Timestamps: