For more than 2 million years, human neural networks kept growing and growing, but apart from some flint knives and pointed sticks, humans had precio… - Yuval Noah Harari

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For more than 2 million years, human neural networks kept growing and growing, but apart from some flint knives and pointed sticks, humans had precious little to show for it. What then drove forward the evolution of the massive human brain during those 2 million years? Frankly, we don’t know.