This week, we're looking at the intersection of race, history and genetics in science writer Nicholas Wade's 2014 book "A Troublesome Inheritance: Genes, Race and Human History." DNA researcher Jennifer Raff and science journalist David Dobbs share their critiques of the claim that differences between genetically distinct "races" are responsible for global divergence in cultural and political structures. And blogger Scicurious walks us through the (delicious) basics of the scientific method with Cookie Science.