http://www.physorg.com/news/2010-12-far ... space.htmlResearch published today, Friday, 3 December 2010, in New Journal of Physics, details a physical model, which can potentially explain how the spreading of Neolithic farmers was slowed down by the population density of hunter-gatherers.
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http://iopscience.iop.org/1367-2630/12/ ... 2/fulltext