http://www.amren.com/ar/2000/12/
I know that this is retreading old ground, but it something that ALL White Nationalists need to learn off by heart, in order to be able to authoritatively deliver an irrefutable rebuttal to the purveyors of this particular nonsense. And the above article, brilliantly explains in layman's terms, exactly how to do it; so, read, absorb and employ.