For centuries, the vanished Inca fortress of Ancocagua existed only in lore. Now, at a mountaintop site in Peru, researchers are zeroing in on a discovery that could reshape what we know of the empire ...

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Note: another source of randomness is the order of Python sets: it is based on Python's hash() function, which is randomly "salted" when Python starts up (this started in Python 3.3, to prevent some ...