Tests on three mummies found in Argentina have shed new light on the Inca practice of child sacrifice.
Scientists have revealed that drugs and alcohol played a key part in the months and weeks leading up to the children's deaths.
Tests on one of the children, a teenage girl, suggest that she was heavily sedated just before her demise.
She is preserved this well because she was frozen during sleep and kept in a dry cold condition at more than 6000 meters above sea level all this time. No other treatment was necessary.
Found in 1999 near the top of the Llullaillaco volcano, in northwestern Argentina, she was an archaeological revolution for being one of the best preserved mummies, since there was even blood in her body and her internal organs remained.
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