the same results [@sibley2014]. Because impurities and surface heterogeneities have a large effect on measurements, experiments are very difficult to reproduce. On top of this, one needs access to microscopic length scales to get to the details and the outcome of experiments on a macroscopic level only depends very weakly on these small length scales [@bonn2009]. With the advent of Molecular Dynamics (MD) [@koplik1988; @koplik1989; @thompson1989; @thompson1990] simulations, and new experimental techniques, such as Atomic Force Microscopy (AFM) [@checco2006], it is now possible to access length and time scales at the contact line that were not accessible before. While MD simulations still can only probe small systems for short times, a couple of fundamental discoveries have been made. Although it had been argued that continuum models break down all together at the contact line [@dussan1979], it was found that both the Navier-Stokes equations and Young’s equation hold up even down to the nanometer scale [@bocquet2010; @seveno2013]. Furthermore, support was found for contact line slip [@thompson1989], precursor films [@he2003], and non-static dynamic microscopic contact angles [@shen1998]. Apart from simulations, precursor films have also been found experimentally [@hardy1919; @kavehpour2003].

In addition to the experimental difficulties and often contradicting findings, another reason that 