The ancient Monte Alto people of Mesoamerica, for example, used stone that had been magnetized when struck by lightning to build giant heads and potbellied sculptures centuries before the rise of the great Maya civilizations. A new study published in the Journal of Archaeological Science suggests this civilization, which flourished in present-day Guatemala around 500 B.C. to 100 B.C., must have had some way to detect the relative strength of the magnetized stones.
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