A Comment on “Meeting the Contact-Mechanics Challenge” by Muser et al. 
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The recent paper “Meeting the Contact-Mechanics Challenge”  is a very useful and tremendous effort to elucidate and compare various theories and numerical models for the contact of rough surfaces. It is easy to understand why this problem has attracted a lot of interest, as many imagine this as a very basic problem of tribology. The main motivation in the past for these kinds of models of rough contact was a qualitative understanding of linearity in Amonton’s law, which, however, is explained easily with a number of models, from the fully plastic one of Bowden and Tabor, to the elastic ones of Archard, Greenwood-Williamson and Persson. It is possible that tribology remains too complex for quantitative modeling, and these efforts focusing on roughness remain largely academic, and so far haven't made much progress in quantitative predictions of wear, adhesion, and friction since the times of Leonardo in 1500 so there is no alternative to use empirical measurements for friction...