Archaeologists unveil Monte Sierpe, a monumental open-air accounting system that reveals the sophisticated economic secrets of the largest pre-Columbian empire.
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A perplexing string of deaths and disappearances among top researchers is raising urgent questions about national security and the fine line between coincidence and conspiracy.
New research reveals a major part of the Greenland Ice Sheet melted away 7,000 years ago, highlighting its surprising fragility in the face of warming.
