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64: The Universal Currency: Energy and Civilization by Vaclav Smil

Made You Think

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The pre-Hispanic inhabitants of the basin of Mexico always ate plenty of prickly pears, which were easy to gather from the many species of cacti. Pears pulp is overwhelmingly about 88% water and has an energy density of just 1.7 megajoules per kilogram. Even a small woman surviving only on carbohydrates of cactus pears would have to eat 5 kilograms of this fruit every day. But she could get the same amount of energy from only about 650 grams of ground corn consumed as tortillas.

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