 But despite these widely accepted findings, it is in the discussion of these distributions that the idea of a biological basis for our traditional understanding of race classifications has re-emerged. Based on the analysis of large sets of genetic variants in samples derived from various locations around the globe, a number of researchers have made the claim that human genetic variation displays geographical clustering (see, e.g., Rosenberg et al. 2002; Edwards 2003; Burchard et al. 2003; Bamshad et al. 2003; Leroi 2005; Tang et al. 2005). Importantly, these findings often also gave rise to, or were interpreted to support, the claim that this geographical distribution matches our traditional racial classifications.