By mapping a set of crowd-sourced family trees, researchers were able to watch human migrations over the centuries and learn about changes in behavior over time--like changes in the distance traveled to find love. In the pre-industrial era, people tended to marry someone born within 10 km. Now, that number is more like 100 km. Read the related news story: http://scim.ag/2Fe3T0P
Read the study: http://science.sciencemag.org/content/early/2018/02/28/science.aam9309
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