 Reduction can also be about explanation and methodology. That is, reduction can be about using reductive methodologies to dig down to lower levels because the thought is that this exercise leads to more reductive explanations and more reductive explanations are better than explanations at higher levels. Alex Rosenberg (1997, 2006) controversially divided biology into molecular biology and everything else, which he dubbed “functional biology”. “Reductionism”, Rosenberg argued,