A centuries-old grid of holes in the Andes may have been a ‘spreadsheet’ for accounting and exchange The ConversationScientists may finally have an explanation for the centuries-old 5,200 mystery holes in the Peruvian Andes Live ScienceWhy did the Inca dig thousands of holes in this mountain? We may now know. National GeographicWe May Finally Know The Purpose of 5,200 Mystery Holes in Peru ScienceAlertMysterious holes in Andean mountain may be an Inca spreadsheet New Scientist
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