Archaeologists have discovered rock etchings that are believed to go back 6,000 years in Coahuila, Mexico's white desert. Experts believe that the drawings, mainly lines and circles, were done by ... more 
Archaeologists have discovered rock etchings that are believed to go back 6,000 years in Coahuila, Mexico's white desert. Experts believe that the drawings, mainly lines and circles, were done by hunter-gathers that roamed the area. Felipe Maya reports. less 
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Wed, Jul 10, 2013 7:00 PM EDT