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AI Summary
- Steven Pinker's research shows violence has declined over 10,000 years—including the 20th century—when measured by violent deaths per capita, presenting data-driven optimism
- New book explores 'common knowledge' concept: how nested levels of awareness (I know that she knows that I know) shape money, power, and everyday interactions
- Pinker uses poker and other examples to illustrate how common knowledge functions differently from mere information and influences human behavior