Genetic admixure : When people from different groups mix . ( CNN ) -- Most people are carrying around historical records in their DNA , with clues to how people from genetically distinct groups intermingled over the last 4,000 years . There have been many instances of this happening . Researchers use DNA to record historical events .
Genetic admixure : When people from different groups mix . There have been many instances of this happening . Researchers use DNA to record historical events .