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Aug 7, 2014 05:15 PM ET // Paul Heltzel
A sandstorm exposes undiscovered geoglyphs near the mysterious Nazca rock lines.
Jun 27, 2014 11:30 AM ET // George Dvorsky,
The ancient string-based devices were used to solve mathematical problems and assist in record-keeping.
May 5, 2014 06:30 PM ET // Stephanie Pappas, LiveScience
Intricate rock lines in the Peruvian desert probably advertised for ancient trade gatherings.