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22-Dec-2017 08:46

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Around this time, farming techniques began to spread out of Anatolia - now Turkey - across Europe and Asia, archaeological evidence shows.The farmers themselves may have moved, or natives may have adopted words along with agricultural technology.

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Scientists attempt to date genetic changes by tracing back to such spread, using a statistical model that assumes genes have a certain mutation rate over time.

"No matter how we [changed] the analysis or assumptions, we couldn't get a date of around 6,000 years," says Gray.