"How did the marriage customs of northern Europe lead to the spread of windmills?" http://www.businessinsider.com/how-the-modern-world-arose-from-the-north-sea-2014-10#ixzz3HW0a1zDC … i dunno!!
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@amerika_blog@JayMan471 not so much the feudalism as the manor system. lots of vry interesting selection pressures there, i think.Thanks. Twitter will use this to make your timeline better. UndoUndo
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