Ice Age

Over those 20,000 years humankind moved from hunting mammoth with stone-tipped spears to exploring the solar system with spaceships not thanks to the evolution of more dexterous hands or bigger brains (our brains today seem actually to be smaller).17 Instead, the crucial factor in our conquest of the world was our ability to connect many humans to

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After millions of years of achingly slow change, cultural complexity began to expand exponentially. The pools of shared knowledge in human communities began to accumulate across generations and adapt to local ecologies. This tribe-level learning (not heightened individual brainpower) is the secret to how our kind adapted to widely differing climate

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