China's Huai River heating policy drew an arbitrary line across the country: free coal for the north, nothing for the south. Because migration was tightly controlled, this created a perfect natural experiment. People born north of the river lived 3 years less and their children completed nearly a full year less of schooling.
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At 43:50 · chapter starts 42:20
The Linos and Severnini study, published in the Journal of the Association of Environmental and Resource Economists, delivers two major findings. First, the headline: even below EPA and WHO guidelines, air pollution measurably impairs cognition across all seven domains tested — verbal ability, attention, flexibility, working memory, math, processing speed, and problem-solving — for the working-age population, with the largest effects in adults under 50. [1] — Andrea Linos "Even when air pollution stays below EPA and WHO guidelines, cognition is measurably impaired across seven cognitive domains — including mem…" 26:46 Second, and most novel: pollution specifically hits memory. Because memory underlies so much professional knowledge work, the productivity implications are potentially vast. On average, a high-pollution day shifts your cognitive percentile ranking by about 6 points — so Duckworth and Dubner on their high-PM2.5 day in Philly and NYC might have scored as well as Levitt had conditions been equal.
A baseball-playing junior who learned about compound interest now wants to quit the sport to start working and investing. George says let him decide and own it. Jade says team sports build something a job can't replace — try doing both during off-season first before making the call permanent.
May is 33, carries $69K in combined household debt, and wants to spend 11–13 years training to become a forensic pathologist at $14K/year in tuition. The prerequisite is non-negotiable: zero debt before a single class. Then, with the spouse earning $4,500/month and able to run the household debt-free, cash-flowing medical school is genuinely possible.
Kavak launched the Jedi Academy, an internal program where every employee — from CEO to mechanics — completes a 6-week training and ships a production-ready AI agent. The message to staff was blunt: train and adapt, or this may not be the right place for you.
The worst AI outcome for young people isn't cheating on homework. It's that passive, mindless consumption strips away the motivation and agency their brains need to develop. The second worst outcome is banning AI from classrooms entirely. The winning path is giving students AI-powered agency.
Prompting AI effectively is a skill that should be taught in K-12. The best prompter in history? Socrates. His method of relentlessly asking precise questions to uncover truth is exactly what powerful AI interaction looks like — and schools should explicitly teach it.
When ChatGPT launched in November 2022, Fei-Fei Li's first move was to email her child's elementary school principal and offer to lecture teachers and students. No investor or tech company did that. Teachers are scared, forgotten, and lectured at — and if they're not helped, neither are the kids.
After the KSI show exposed how hard physical comedy really is, Andrew Santino sincerely proposed doing a semester at clown school in France. Bobby agreed. This is apparently a real plan.
K-12 schools ask students to sit still, raise their hand, use fine motor skills, and be pleasers — behaviors that describe girls more than boys. Boys are twice as likely to be suspended for the same behavior, and five times as likely if they're Black. The system needs male teachers, national service, and kindergarten starting at 6 for boys.
Sunk costs are gifts from your former self — and like all gifts, you're allowed to decline them. Godin reframes every stuck-due-to-sunk-cost situation as a single question: knowing what you know now, would you choose this again?
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