Our ancestors traveled widely. Scientists have detected the faint genetic traces left by medieval crusaders in the Middle East. The team says they found a particular DNA signature, which recently appeared in Lebanon and is probably linked to the crusades.
The finding comes from the Genographic Project, a major effort to track human migrations through DNA. Details of the research have been published in the American Journal of Human Genetics. A layman’s interpretation has been published by the BBC at http://news.bbc.co.uk/2/hi/science/nature/7316281.stm.
My thanks to John Rees for telling me about this story.