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Bird Poop Powered One of the Americas’ Greatest Ancient Kingdoms
Five thousand years ago the Andean people of Peru discovered something more valuable than gold. Countries eventually fought bloody wars over it. Six hundred years ago it inspired the first conservation laws in human history.
In the thirteenth century the Incas built the largest empire in pre-Columbian America. This massive civilization of twelve million people stretched across rugged mountains and dry deserts. Most of this land was completely infertile. How did they feed an empire?
They used a secret weapon left behind by coastal seabirds. These birds ate massive amounts of fish packing their…
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