 Before discussing the third argument Creationists level against evolution, it is worth pausing over this second one. Most if not all professional evolutionists argue that sometimes natural selection is not a significant causal factor.  In this sense, it is false that selection is something that by definition is and always is the reason for lasting change.  The fittest do not always win.  It cannot be a tautology. In the 1930s, the American population geneticist Sewall Wright devised his hypothesis of “genetic drift,” arguing that sometimes mere chance can lead to effects overriding the forces of selection (Wright 1931, 1932). Although, at first, this was embraced enthusiastically (Dobzhansky 1937), it soon became clear that at the gross physical (phenotypic) level it is at most minor (Coyne, Barton, and Turelli 1997). However at the level of the gene (genotype), it is still thought very important. Indeed, it is a powerful tool in discovering the exact dates of key evolutionary events, especially those involving speciation (Ayala 2009). Moreover, as we shall see in a moment, somewhat paradoxically, as Creationism has evolved (!), increasingly the virtues of selection working at the microevolutionary level have become apparent. Thus can one explain the diversity of life on earth – it evolved since leaving the Ark, which contained only generic kinds. For all its supposed faults, there is a better discussion of natural selection at the Creationist museum in Kentucky than in the Field Museum in Chicago, 300 miles north. The bar on macroevolution remains absolute.