Roughness-induced critical phenomena in a turbulent flow
  I present empirical evidence that turbulent flows are closely analogous to critical phenomena, from a reanalysis of friction factor measurements in rough pipes. The data collapse found here corresponds to Widom scaling near critical points, and implies that a full understanding of turbulence requires explicit accounting for boundary roughness. 
Nigel Goldenfeld (University of Illinois at Urbana-Champaign)